Chapter 12

First, that growth being an integration with the organism of such environing matters as are of like nature with the matters composing the organism, its growth is dependent on the available supply of such matters. Second, that the available supply of assimilable matters being the same, and other conditions not dissimilar, the degree of growth varies according to the surplus of nutrition over expenditure. Third, that in the same organism the surplus of nutrition over expenditure is a variable quantity; and that growth is unlimited or has a definite limit according as the surplus does or does not progressively decrease,--a proposition exemplified by the increasing growth of organisms that do not expend force, and by the definitely limited growth of organisms that expend much force. Fourth, that among organisms that are large expenders of force, the size ultimately attained is, other things equal, determined by the initial size. Fifth, that where the likeness of other circumstances permits a comparison, the possible degree of growth depends upon the degree of organisation: an inference testified to by the larger forms among the various divisions and subdivisions of organisms.

_Why Do Organisms Cease to Grow_

Why should not all organisms, when supplied with sufficient material, continue to grow as long as they live? We have found that organisms are mostly built up of compounds which are stores of force. These substances being at once the materials for organic growth and the sources of organic force, it follows, from the persistence of force, that growth is substantially equivalent to the absorbed nutriment minus the nutriment used up in action. This, however, does not account for the fact that in every domestic animal the increments of growth bear continually decreasing ratios to the mass, and finally come to an end. Nevertheless, it is demonstrable that the excess of absorbed over expended nutriment must decrease as the size increases. Since in similar bodies the areas vary as the squares of the dimensions and the masses vary as the cubes, it follows that, however great the excess of assimilation over waste may be during the early life of an active organism, there must be reached, if the organism lives long enough, a point at which the surplus assimilation is brought to nothing--a point at which expenditure balances nutrition, a state of moving equilibrium. Obviously, this antagonism between assimilation and expenditure must be a leading cause of the contrast in size between allied organisms that are in many respects similarly conditioned.

_Development, or Increase of Structure_

In each of the organic sub-kingdoms the change from an incoherent, indefinite homogeneity to a coherent definite heterogeneity is illustrated in a quadruple way. The originally-like units or cells become unlike, in various ways, and in ways more numerously marked as the development goes on. The several tissues which these several classes or cells form by aggregation, grow little by little distinct from each other; and little by little become structurally complex. In the shoot as in the limb, the external form, originally very simple and having much in common with countless simple forms, organic and inorganic, gradually acquires an increasing complexity, and an increasing unlikeness to other forms, and meanwhile, the remaining parts of the organism, having been developed severally, assuming structures diverging from each other and from that of this particular shoot or limb, there has arisen a greater heterogeneity in the organism as a whole.

The most remarkable induction of von Baer comes next in order. It is that in its earliest stage every organism has the greatest number of characters in common with all other organisms in their earliest stages; that at each subsequent stage traits are acquired which successively distinguish the developing embryo from groups of embryos that it previously resembled--thus step by step diminishing the group of embryos which it still resembles; and that thus the class of similar forms is finally narrowed to the species of which it is a member. For example, the human germ, primarily similar to all others, first differentiates from vegetal germs, then from invertebrate germs, and subsequently assumes the mammalian, placental unguiculate, and lastly the human characters.

The development of an individual organism is at the same time a differentiation of its parts from each other and a differentiation of the consolidated whole from the environment; and in the last as in the first respect there is a general analogy between the progression of an individual organism and the progression of the lowest orders of organisms to the highest orders.

_The Laws of Multiplication_

Every living aggregate being one of which the inner actions are adjusted to balance outer actions, it follows that the maintenance of its moving equilibrium depends on its exposure to the right amounts of these actions. Its moving equilibrium may be overturned if one of these actions is either too great or too small in amount: either by excess or defect of some inorganic or organic agency in its environment.

Our inquiry resolves itself into this:--in races that continue to exist what laws of numerical variation result from these variable conflicting forces?

The forces preservative of a race are two--ability in each member of the race to preserve itself, and ability to produce other members. These must vary inversely--one must decrease as the other increases. We have to ask in what way this adjustment comes about as a result of evolution.

Including under individuation all those processes completing and maintaining individual life, and under genesis all those aiding the formation and perfecting of new individuals, the two are necessarily antagonistic. Every higher degree of individual evolution is followed by a lower degree of race multiplication, and _vice versâ_. Progress in bulk, complexity or activity involves retrogress in fertility; and progress in fertility involves retrogress in bulk, complexity, or activity. The same quantity of matter may be divided into many small wholes or few large wholes; but number negatives largeness, and largeness negatives number.

It is a general physiological truth that while the building-up of the individual is going on rapidly, the reproductive organs remain imperfectly developed and inactive; and that the commencement of reproduction at once indicates a declining rate of growth and becomes a cause of arrest in growth.

It has now to be noticed how complexity of organisation is hindered by reproductive activity and conversely. The hydra's power to produce young ones from nearly all parts of its body is due to the comparative homogeneity of its body, while it is not improbable that the smallness of human fertility, compared with the fertility of large feline animals, is due to the greater complexity of the human organisation--more especially the organisation of the nervous system.

Of the inverse variation between activity and genesis we have examples in the contrast between the fertility of birds and the fertility of mammals. Comparing the large with the large and the small with the small, we see that creatures which continually go through the muscular exertion of sustaining themselves in the air and propelling themselves rapidly through it are less prolific than creatures of equal weights which go through the smaller exertion of moving about over solid surfaces. The extreme infertility of the bat is most striking when compared with the structurally similar but very prolific mouse; a difference in the rate of multiplication which may fairly be ascribed to the difference in the rate of expenditure.

_Interpretation and Qualification_

Derived as the self-sustaining and waste-sustaining forces are from a common stock of force, it necessarily happens that, other things being equal, increase of the one involves decrease of the other. It may therefore be set down as a law that every higher degree of organic evolution has for its concomitant a lower degree of the peculiar organic dissolution which is seen in the production of new organisms.

How is the ratio between individuation and genesis established in each case? All specialties of the reproductive process are due to the natural selection of favourable variations. Given a certain surplus available for race preservation, and it is clear that by indirect equilibration only can there be established that peculiar distribution of this surplus which is seen in each case.

Here a qualification must be made. Recognising the truth that every increase of evolution which is appropriate to the circumstances of an organism brings an advantage somewhat in excess of its cost, the general law, more strictly stated, is that genesis decreases not quite so fast as individuation increases. The result of greater individuation--whether it takes the form of greater strength or higher speed, facilitates some habitual movement or utilises better the absorbed aliment--is a greater surplus of vital capital; part of which goes to the aggrandisement of the individual and part to the formation of new individuals. Hence every type that is best adapted to its conditions has a rate of multiplication that insures a tendency to predominate. Survival of the fittest, acting alone, is ever replacing inferior species by superior species. But beyond the longer survival, and therefore greater chance of leaving offspring, which superiority gives, we see here another way in which the spread of the superior is insured. Though the more evolved organism is the less fertile absolutely, it is the more fertile relatively.

_Multiplication of the Human Race_

What causes increase or decrease of genesis in other creatures causes increase or decrease of genesis in man. It is true that, even more than hitherto, our reasonings are here beset with difficulties. So numerous are the inequalities in the conditions that but few unobjectionable comparisons can be made. The human races differ not only in their sizes and foods, and in the climates they inhabit, but also their expenditures in bodily and mental action are extremely unequal.

The increase of fertility caused by nutrition that is greatly in excess of expenditure is to be detected by comparing populations of the same race or of allied races one of which obtains good and abundant sustenance much more easily than the other. On carrying out such comparisons it is seen that in the human race, as in all other races, such absolute or relative abundance of nutriment as leaves a large excess after defraying the cost of carrying on parental life, is accompanied by a high rate of genesis.

It is also apparent that relative increase of expenditure, leaving a diminished surplus, reduces fertility. That infertility is generally produced in women by mental labour carried to excess is shown in the fact that most of the flat-chested girls who survive their high-pressure education are incompetent to bear a well-developed infant and to supply it with the natural food for the natural period. It is a matter of common remark how frequently men of unusual mental activity leave no offspring.

It is likely to be urged that since the civilised races are on the average larger than many of the uncivilised races, and since they are also somewhat more complex as well as more active, they ought, in accordance with the alleged general law, and other things being equal, to be less prolific. But other things are not equal; and it is to the inequality of the other things that this apparent anomaly is attributable.

One more objection has to be met. Cases may be named of men conspicuous for activity, bodily and mental, who were also noted, not for less generative power than usual, but for more. The cases are analogous to some before-named in which more abundant food simultaneously aggrandises the individual and adds to the production of new individuals--the differences between cases being that instead of a better external supply of material there is a better internal utilisation of materials. Some peculiarity of organic balance, some potency of the digestive juices, gives to the system a perpetual high tide of rich blood that serves at once to enhance the vital activities and to raise the power of propagation. The _proportion_ between individuation and genesis remains the same: both are increased by the increase of the common stock of materials.

_Human Population in the Future_

Any further evolution in the most highly-evolved of terrestrial beings--man--must be of the same nature as evolution in general. It must be an advance towards completion of that continuous adjustment of internal to external relations which was shown to constitute life.

Looking at the several possibilities, and asking what direction this further evolution, this more complete moving equilibrium, this better adjustment of inner to outer relations, this more perfect co-ordination of action is likely to take:--the conclusion is that it must take mainly the direction of a higher intellectual and emotional development. There is abundant scope for development in ascertaining the conditions of existence to which we must conform; and in acquiring a greater power of self-regulation.

What are those changes in the environment to which, by direct or indirect equilibration the human organism has been adjusting itself, is adjusting itself now, and will continue to adjust itself? And how do they necessitate a higher evolution of the organism? In all cases pressure of population is the original cause. Were it not for the competition this entails, so much thought and energy would not be spent on the business of life; and growth of mental power would not take place. Difficulty in getting a living is alike the incentive to a higher education of children, and to a more intense and long-continued application in adults. Nothing but necessity could make men submit to this discipline; and nothing but this discipline could produce a continued progression.

Excess of fertility is then the cause of man's further evolution. And the obvious corollary is that man's further evolution itself necessitates a decline in his fertility. The further progress of civilisation will be accompanied by an enhanced cost of individuation: whether it be in greater growth of the organs which subserve self-maintenance, in their added complexity of structure, or in their higher activity, the abstraction of the required material, implies a diminished reserve of materials for race maintenance. This greater emotional and intellectual development does not necessarily mean a mentally laborious life--for, as the goal becomes organic, it will become spontaneous and pleasurable.

The necessary antagonism of individuation and genesis not only fulfils the _a priori_ law of maintenance of the race from the monad up to man, but insures final attainment of the highest form of this maintenance--a form in which the amount of life shall be the greatest possible and the births and deaths as few as possible. From the beginning pressure of population has been the proximate cause of progress. After having duly stocked the globe with inhabitants; raised all its habitable parts into the highest state of culture; brought all processes for the satisfaction of human wants to perfection; developed the intellect into complete competency for its work, and the feelings into complete fitness for social life; the pressure of population as it gradually finished its work, must gradually bring itself to an end.

Changes, numerical, social, organic, must by their mutual influences work unceasingly towards a state of harmony--a state in which each of the factors is just equal to its work. And this highest conceivable result must be wrought out by the same universal process which the simplest inorganic action illustrates.

Principles of Sociology

"Principles of Sociology" was published in four parts from 1876 to 1880. It forms part of a connected series. In "First Principles" inorganic evolution--that of the stars and of the solar system--was outlined; organic evolution was dealt with in "Principles of Biology;" and in the present treatise, "Principles of Sociology," we approach super-organic evolution, and are introduced to the science of society under its Comtist title "Sociology."

Super-organic evolution may be marked off from, organic by taking it to include all those processes and products which imply the co-ordinated action of many individuals. Commencing with the development of the family, sociology has next to describe and explain the rise and development of political organisation; the evolution of the ecclesiastical structures and functions; the control embodied in ceremonial observances; and the relations between the regulative and operative divisions of every society.

_I.--Domestic_

That evolution decreases the sacrifice of individual life to the life of the species, we may see on glancing upwards from the microscopic protozoa, where the brief parental life disappears absolutely in the lives of the progeny, to the mammalia, where the greatest conciliation of the interests of the species, the parents and the young, is displayed. The highest constitution of the family is reached where there is such conciliation between the needs of the society and those of its members, old and young, that the mortality between birth and the reproductive age falls to a minimum, while the lives of adults have their subordination to the rearing of children reduced to the smallest possible. The diminution of this subordination takes place in three ways: First, by elongation of that period which precedes reproduction; second, by fewer offspring born, as well as by increase of the pleasure taken in the care of them; and third, by lengthening of the life which follows cessation of reproduction. Let us bear in mind that the domestic relations which are ethically the highest, are also biologically and sociologically the highest.

MARRIAGE

The propriety of setting out with the foregoing purely natural-history view will be evident upon learning that among low savages the relations of the sexes are substantially like those common among inferior creatures. The effect of promiscuity, however, being to hinder social evolution, wherever it was accompanied by unions having some duration, the product of such unions were likely to be superior to others, and from this primitive stage domestic evolution takes place in several directions by increase of coherence and definiteness.

From promiscuity we pass to that form of polyandry in which the unrelated husbands have but one wife; thence to the form in which the husbands are related; and finally to the form in which they are brothers only, as in the fraternal polyandry of the ancient Britons. It is almost needless to point out that, as in passing from promiscuity to polyandry the domestic relations become more coherent and definite, so do they in passing from the lower forms of polyandry to the higher. That polygyny is better than polyandry may be concluded from its effects. It conduces in a higher degree to social self-preservation than the inferioi types of marital relations by making possible more rapid replacement of men lost in war, and so increases the chance of social survival. By establishment of descent in the male line it conduces to political stability; and, by making possible a developed form of ancestor-worship, it consolidates society.

MONOGAMY

Societies which from generation to generation produce in due abundance individuals who relatively to the requirements are the best physically, morally, and intellectually, must become the predominant societies, and must tend through the quiet process of industrial competition to replace other societies. Consequently, marital relations which favour this result in the highest degree must spread; while the prevailing sentiments and ideas must become so moulded into harmony with them that other relations will be condemned as immoral. The monogamic form of the sexual relations is manifestly the ultimate form; and any changes to be anticipated must be in the direction of completion and extension of it.

_II.--Political Organisation_

A society is formed only when, besides juxtaposition there is co-operation. Co-operation is made possible by society and makes society possible. It pre-supposes associative men; and men remain associated only because of the benefits co-operation yields them. But there cannot be concerted actions without agencies by which actions are adjusted in their times, amounts, and kinds; and the actions cannot be of different kinds without the co-operators undertaking different duties. That is to say, the co-operators must become organised, either voluntarily or involuntarily.

AGGREGATION

The political evolution manifested by increase of mass is political aggregation. One of the laws of evolution at large is that integration results when like units are subject to the same force or the like forces; and from the first stages of political integration to the last this law is illustrated. Likeness in the units forming a social group being one conditioned to their integration, a further condition is their joint reaction against external action: co-operation in war is the chief cause of social integration. The temporary unions of savages for offence and defence show the initiatory steps. When many tribes unite against a common enemy, long continuance of their combined action makes them coherent under some common control. And so it is subsequently with still larger aggregates.

DIFFERENTIATION