A Book of Exposition

The mother not infrequently emits them two at a time, one above the other; not infrequently, also, the uppermost of the two eggs hatches before the other, while the latter fades...

When the escapement _B_ is rocked, it withdraws the lower pawl _b_, as shown in Fig. 6, at the same time raising the upper pawl, so that it engages and momentarily arrests the n...

We must look closely at the foot lever if we are to understand it. It is arched or bent; the front pillar of the arch stretches from the summit or keystone, where the weight of...

It is a pleasure to acknowledge indebtedness to my wife for assistance in editing and to Dr. Ray Palmer Baker, Head of the Department of English at the Institute, for suggestion...

Among other things, knowledge tells us: "The seedsman need not go to the expense of waging war upon the weevil. When the peas arrive in the granary, the harm is already done; it...

This type; which we have thus reached by our imitativeness, we now have fixed upon us, for better or worse. Now no type can be _wholly_ disadvantageous; but, so far as our type...

In the first case, with our sense perceptions 100,000 times faster, all events in nature would appear to us 100,000 times slower. This would then be a stationary and immovable w...

From the stuff-chest the mixture is pumped into what is known as the "mixing" or "regulating" box. Here the stream first passes over the "sand-tables" in a continuous flow. Thes...

Generous Mother Nature, who supplies man's wants in such bountiful fashion, has furnished on her plains and in her forests an abundance of material that may be transformed into...

SIR ARTHUR KEITH, M.D., LL.D., F.R.S., born in Aberdeen, 1866, was educated at the University of Aberdeen; at University College, London; and at the University of Leipzig. From...