Part 3

Honest and intelligent administration in every department of the city government would reduce expenditures, but the extent of the reduction that might be made would depend largely upon the proper amendment of certain laws, and to an even greater extent upon the development of a thoroughly informed public sentiment that would sustain retrenchment and economy. The expenses of the city are far greater than they should be, but it is going to be a difficult matter to make even an appreciable beginning in economy so long as the State Legislature is permitted to exercise practically unlimited power to regulate the financial affairs of the municipality. Persons and corporations, be they honest or corrupt, when they seek to obtain money from the city treasury for any purpose, are going to proceed along the line of least resistance, and the smooth and open way has long been the Legislature at Albany. Every session of that body adds something to the expenses of the city, and it is a short and dull one that does not add many thousands of dollars to the burden of the New York taxpayers.

The revenues of the municipality are so small in comparison with what they should be that it is a difficult matter to find any excuse for the theory of government that existed in the days when perpetual franchises were given away. It is small consolation that the policy of municipal ownership is at last to prevail after so much of the public property has passed into the possession of private corporations. If all the outstanding franchises that were the property of the people had been sold on short terms for percentages even as large as have been fixed in recent cases, the city to-day would drive from that source an annual revenue of more than $5,000,000, instead of the paltry $300,000 now collected.

The mistakes of the past, however, are beyond undoing, and the taxpayers must look to the future for relief from the burdens they bear. They are paying now $15,000,000 a year for the sentiment that demanded a city great in all save honesty and political wisdom. Consolidation in fact as well as sentiment must result to prove the material advantage of the arrangement. Public opinion and politicians must realize sooner or later that income and expenses are to be adjusted the one to the other upon sound and enduring principles of business, honesty, and intelligence. There must be a union of public and political interests. Every section of the great city must be brought into close touch with every other section by cheap and rapid transit.

The possibilities of the future are greater than the dreams of to-day, but new policies and new methods must and will prevail. The development of Greater New York must not be hampered by a financial system antiquated and imperfect. The city should have power to develop its material resources into revenue-yielding improvements, and then, with honest and intelligent government, the burden of taxation will be reduced to a minimum, and the ideal of the grandest municipality in the world will have been achieved.

A BUBBLE-BLOWING INSECT.

BY PROF. E. S. MORSE.

Many years ago, while preparing an elementary book on zoölogy, I had occasion to make a drawing of the little insect which is found on grass and other plants immersed in flecks of froth. This substance is commonly known as frog spittle or cuckoo spit, and, being found in the spring, is known in France as “spring froth.”

Works on entomology gave the general statement that this insect emitted the frothy mass from its body. Curious to ascertain what peculiar gas-secreting apparatus was contained within its anatomy, I dissected a number of specimens, without finding a trace of any structure that could produce from within the body a single bubble of air. On the contrary, I found that the little insect emitted a clear, somewhat viscid fluid, and by means of appendages at the extreme tip of its tail secured a moiety of air by grasping it, so to speak, and then instantly releasing it as a bubble in the fluid it had secreted. At the time of this observation--twenty-five years ago--I supposed that entomologists were familiar with this fact, but, on the appearance of my little book, I received a letter from the late Dr. Hermann Hagen, the distinguished entomologist, stating that he had ransacked his library and failed to find any reference of the nature of my statement. Doubtless the whole history of this insect has since been published, but a somewhat superficial survey of the literature has failed to reveal any reference to the matter. In this connection it is interesting to observe how often the more easily accessible facts of Nature escape the special student. The history of science is replete with such instances. One can hardly take up any subject connected with the life history of animals without finding lacunæ which ought to have been filled long ago. The facts in regard to the ossification of the hyoid bones in man is a case in point. The persistence of these erroneous concepts or half-truths comes about by the acceptance at the outset of some fairly trustworthy account by an authority on the subject, and ever after the statements are copied without a doubt being expressed as to their accuracy.

If we look over the literature of the subject under discussion, we find that in nearly every case the statement in regard to the spit-insect conveys the idea that the creature secretes the froth in which it is immersed. Beginning with De Geer in the last century, we quote as follows: “One may see coming out of the hinder part of its body a little ball of liquid, which it causes to slip along, bending it under its body. Beginning again the same movements, it is not long in producing a second globule of liquid, filled with air like the first, which it places side by side with and close to the preceding one, and continues the same operation as long as there remains any sap in its body.” Kirby and Spence, in their Entomology, describe “the white froth often observed on rose bushes and other shrubs and plants, called by the vulgar ‘frog spittle,’ but which if examined will be found to envelop the larva of a small hemipterous larva (_Aphrophora spumaria_), from whose anus it exudes.” In Westwood’s Insects we find the following statement: “One of the best-known insects in the family is the _Aphrophora spumaria_, a species of small size which frequents garden plants, the larva and pupa investing themselves with a frothy excrementitious secretion which has given rise to various fancies. A species of _Aphrophora_ is also found in great quantities upon trees in Madagascar, the larva of which has the power of emitting a considerable quantity of clear water, especially in the middle of the day, when the heat is greatest.” Here the statement is definitely made that the froth is excrementitious, and the Madagascar insect is shown to be different from _Aphrophora_ in that it exudes a clear water. In Dr. Harris’s Treatise on some of the Insects Injurious to Vegetation, of Massachusetts, we find a most definite statement as to the origin and nature of this froth. He says: “Here may be arranged the singular insects, called frog hoppers (_Cercopididæ_), which pass their whole lives on plants, on the stems of which their eggs are laid in the autumn. The following summer they are hatched, and the young immediately perforate the bark with their beaks and begin to imbibe the sap. They take in such quantities of this that it oozes out of their bodies continually in the form of little bubbles, which soon completely cover up the insects.” In Dr. Packard’s admirable Guide to the Study of Insects the statement is made that “_Helochara_ and _Aphrophora_, while in the larva state, suck the sap of grasses and emit a great quantity of froth, or in some cases a clear liquid, which in the former case envelops the body and thus conceals it from sight. It is then vulgarly called ‘toad’s spittle.’”

In other accounts it is stated that the larvæ live covered by masses of froth which the insects produce by expelling from their beak the juices drawn out of the tree.

The above extracts are sufficient to indicate the common belief among entomologists that the insect in some way emits this froth from the body. A most cursory examination of the creature, however, shows that its only secretion is a clear fluid.

The so-called frog spittle or cuckoo spit (Fig. 1) appears as little flecks of froth on grass, buttercups, and many other plants during the early summer. These flecks of froth may be found very commonly at the junction of the leaf with the stem. Immersed in this froth is found a little green insect, sometimes two or three of them, concealed by the same moist covering. This little creature represents the early stage of an insect which in its full growth still lives upon grass, and is easily recognized by its triangular shape and its ability of jumping like a grasshopper. There are a number of species; the one living on grass apparently confines itself to the grass alone, though I have seen one species that frequents a number of different plants. A species found on the white pine is dark brown in color, and the froth in which it is found not only hangs pendent from the branch, but the lower portion appears as a large drop of clear water.

Let one provide himself with a good hand lens, a bit of glass (a watch crystal is especially suitable for this purpose), and a common camel’s-hair brush, and he is ready to make a preliminary study of _Aphrophora_. The brush is convenient for easily removing the insect from the froth which invests it. If the insect is cleared from the mass of froth, it will crawl quite rapidly along the stem of the plant, stopping at times to pierce the stem for the purpose of sucking the juices within, and finally settling down in earnest, evidently exerting some force in thrusting its piercing apparatus through the outer layers, as shown by the firm way in which it clutches the stem with its legs. After sucking for some time, a clear fluid is seen to slowly exude from the posterior end of the abdomen, flowing over the body first and gradually filling up the spaces between the legs and the lower part of the body and the stem upon which it rests (Fig. 2). During all this time not a trace of an air bubble appears; simply a clear, slightly viscid fluid is exuded, and this is the only matter that escapes from the insect. In other words, its secretion of clear fluid is precisely like that of the Madagascar species referred to by Westwood and others.

This state of partial immersion continues for half an hour or more. During this time, and even when the insect is roaming up and down the grass or twig, the posterior segments of the abdomen are extended at intervals, the abdomen turning upward at the same time. It is a kind of reaching-up movement, but whether this action accompanies a discharge of fluid or is an attempt at reaching for air I have not ascertained. Suddenly the insect begins to make bubbles by turning its tail out of the fluid, opening the posterior segment, which appears like claspers, and grasping a moiety of air, then turning the tail down into the fluid and instantly allowing the inclosed air to escape (Fig. 3). These movements go on at the rate of seventy or eighty times a minute. At the outset the tail is moved alternately to the right and left in perfect rhythm, so that the bubbles are distributed on both sides of the body, and these are crowded toward the head till the entire fluid is filled with bubbles, and the froth thus made runs over the back and around the stem (Fig. 4).

Even when partially buried in these bubbles the tail is oscillated to the right and left, though when completely immersed the tail is only occasionally thrust out for air which is allowed to escape in the mass apparently without the right-and-left movement, though of this I am not sure. It is interesting to observe that in half a minute some thirty or forty bubbles are made in this way--a bulk of air two or three times exceeding the bulk of the body--without the slightest diminution in the size of the body.

If the insect is allowed to become dry, by resting it upon a piece of blotting paper, and is then placed upon a piece of glass and a drop of clear saliva be allowed to fall upon it, it proceeds to fill up this fluid with bubbles in precisely the same manner as it did with its own watery secretion. It is quite difficult to divest the creature of the bubbles of air which adhere to the spaces between the legs and the segments on the underside of the body. It may be readily done, however, by immersing it in clear water and manipulating it with a brush. If now it is again dried and placed on the glass it will slowly secrete what spare fluid it has in its body, but not the minutest bubble of air is seen to escape. These experiments should be made on glass, for then one may get transmitted light, and the highly refractive outlines of the air bubbles are more quickly detected. Using a higher power with a live cell, new features may be observed. Confining the insect in this way, inclosed in a drop of water, a very clear proof is offered that it gets all the air for its froth in the way I have described. So long as the insect remains surrounded by water not the minutest bubble of air is seen to escape from the body. During this immersion the creature is incessantly struggling to reach the edge of the drop, and no sooner has this been accomplished than it thrusts out its tail and begins the clutching of air and the making of bubbles. The bubbles, however, disappear as soon as made, as the clear water will not preserve them. As the water becomes slightly viscid from the insect’s own secretions, the bubbles remain for a longer time. A bubble will be partially released and then held, or even partially withdrawn, between the claspers.

The claspers seem to be the tergal portions of the ninth segment. On the sides of the seventh and eighth segments may be clearly seen leaflike appendages, which are possibly branchial in their nature (Figs. 5 and 6). They are extremely tenuous, and appear like clusters of filaments, slightly adhering together and forming lamellate appendages similar to the gill-like appendages seen in the early stages of _Potamanthus_, a neuropterous insect, not, however, having the definiteness of these structures. While in _Potamanthus_ one may easily trace the ramifications of the tracheal system, I have not been able to detect a similar connection with these appendages in _Aphrophora_. Certainly the insect does not depend upon these structures for respiration, as when the creature is perfectly dry it seems to suffer no immediate inconvenience, but will crawl about the table or even on the dusty floor and live for an hour or two in this condition. The usually glabrous surface of the body, however, becomes shriveled after a while. On the other hand, it immediately sinks in water, and will live for some time immersed in this way, and this leads me to believe that the appendages above described may perform a slight respiratory function. The fact that the insect immediately sinks may be cited as an additional evidence that it does not emit air.

It is interesting to observe that regarding this stage of _Aphrophora_ as an aquatic stage, since it lives immersed in fluid, we have the same behavior that we observe in the aquatic stages of other _Hemiptera_, as well as in insects of other orders. The great water beetle _Hydrophilus_ has an aquatic larva. Myall, quoting Lyonet, says: “They never remain long at the bottom of the water; air is necessary for them, and this they take in by the tail, which they raise from time to time to the surface of the water.” In the larva of _Dysticus_, another water beetle, the only functional spiracles are the last pair, opening at the tail. The little oval beetles, known as whirligigs, from their rapid whirling motion, when swimming on the surface of the water carry down a bubble of air on the end of the abdomen, and when this has been exhausted in the process of respiration rise to the surface for a fresh bubble. The larvæ of some forms are furnished on each side with long respiratory filaments.

A number of neuropterous insects whose early stages are passed in the water are furnished with branchial tracheæ or false gills. These consist of filaments springing from the sides of the abdominal segments. In the early stages of certain dragon flies the rectum supports epithelial folds which are filled with fine tubes from the tracheal system. Among certain aquatic insects belonging to the order of _Hemiptera_ the creatures reach out the hinder portion of the body to secure air. Dr. Myall, in his very interesting book on the Natural History of Aquatic Insects, says: “A _Nepa_ or a _Ranatra_ may sometimes be seen to creep backward along a submerged weed until the tip of its breathing tube breaks the surface of the water.”

The _Aphrophora_ while immersed in the watery fluid, whether secreted by itself or consisting of clear water which has been supplied to it, reaches out for air in a precisely similar manner. Primarily the froth made by this insect not only keeps the body moist, but acts as a protection against its enemies.

A number of individuals may often be found in one fleck of froth, and they are entirely hidden from sight while immersed in this way. The viscid character of the fluid secreted insures the retention of the air the insect collects in the form of little bubbles. This peculiar feature must have been a secondary acquisition. The bubbles not only surround the insect and the stem upon which it rests, but flows in a continuous sheet between the ventral plates of the abdomen, and the insect probably utilizes this air in the manner of other air-breathing aquatic larvæ--namely, through its spiracles. As many aquatic larvæ respire in two ways, either inhaling air through the spiracles or by means of branchial leaflets, so _Aphrophora_ may likewise utilize its branchial tufts for the same purpose. For this reason we can understand how each fresh bubble added to the mass may aërate the fluid, so to speak, and thus insure at intervals a fresh supply of oxygen.

THE NEGRO SINCE THE CIVIL WAR.

BY N. S. SHALER,

DEAN OF THE SCIENTIFIC SCHOOL OF HARVARD UNIVERSITY.

The admirable conduct of the negro during the civil war made it seem possible to have the readjustment of his relations on the basis of freedom brought about with a minimum of friction. As a whole, the former slaves had stayed on the land where they belonged. Many of those who had wandered, moved by the homing instinct so strong in their race, found their way back to their accustomed places. The bonds of mutual interest and old affections were enough, had the situation been left without outside disturbance, to have made the transition natural and easy. It is true that the negro, with his scant wage paid in supplies, would not have advanced very far in the ways of freedom. He would have been hardly better than the middle-age serf bound to his field. It would, however, have been better to begin with a minimum of liberty, with provision for schooling and a franchise based on education. But this was not to be. Political ends and the popular misconception of the negroes as beings who differ from ourselves only in the color of their skin and in the kink of their hair led to their immediate enfranchisement and to the disenfranchisement of their masters. This was attended by an invasion into the South of the worst political rabble that has ever cursed the land. There were good and true men among the carpet-baggers, but as a lot they were of a badness such as the world has not known since captured provinces were dealt out to the political gamblers of Rome.

The effect of the carpet-bag period on the negroes was to raise their expectations of fortune to the highest point, and then to cast them down. Those of the poorest imaginations looked for forty acres of land and a mule. In the resulting political corruption the native whites and blacks endured even greater losses than the war had inflicted, the most grievous being a great unsettling of the relations between the races. The way in which the white men of the better sort met this trial is fit to be compared with the best political achievements of their folk. Gradually, on the whole without violence, for they had to abstain from that, working within the limits of the Constitution to which they had been forced to trust for their remedies, they rewon control of their wasted communities, and brought them back to civilized order. There was a share of terrorism and shame from such devices as tissue ballots to lessen the dignity of this remarkable work, yet it remains a great achievement--one that goes far to redeem the folly of the secession movement. The full significance of this action is yet to be comprehended.

The overthrow of the carpet-bag governments, quietly yet effectively accomplished, removed the only danger of war between the blacks and whites. We can not well imagine another crisis so likely to bring about a conflict of that kind. The blacks were driven from power. Their desperate leaders would willingly have led them to fight, but the allegiance to the ancient masters was too strong, their trust in the carpet-bagger, for all his affectation of love, too slight to set them on that way. The negro fell back as near as might be to the place he held at the close of the war. His position was thereafter worse than it was at that station in his history, for the confidence and affection which the behavior of their servants during the rebellion had inspired was replaced in the mind of the dominant race by an abiding sense of the iniquities in which the ex-slaves had shared. Thereafter, and to this day, the black man is looked upon as a political enemy, who has to be watched lest he will again win a chance to control the state. In the greater part of the South this fear is passing away. In several States new laws concerning the franchise have made it practically impossible for the negro vote to be a source of danger for some time to come--until, indeed, the negro is better educated and has property. There is a share of iniquity in these laws, as there is apt to be in all actions relating to a situation that rests on ancient evils, but their effect is better than that of terrorism and tissue ballots which it replaces. They will afford time for the new adjustments to be effected.