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The red earth, like that of the Pampas, in which these remains were embedded, contains, according to Professor Ehrenberg, eight fresh-water and one salt-water infusorial animalcule; therefore, probably, it was an estuary deposit. The remains at Punta Alta were embedded in stratified gravel and reddish mud, just such as the sea might now wash up on a shallow bank.

I tried to reject the conviction that my reason forced upon me. I battled against the fatal conclusion, but in vain. It was so. I had no escape from it. I loved an animalcule! It is true that, thanks to the marvellous power of my microscope, she appeared of human proportions.

I crawled, a mere atom, within its folds, helpless, insignificant, absurd. The houseless forms that shared my vigil were my fellows. What were we? Animalcule upon its bosom, that it saw not, heeded not. For company I would mingle with them: ragged men, frowsy women, ageless youths, gathered round the red glow of some coffee stall. Rarely would we speak to one another.

Once warned of the probable difficulty of seeing the animalcule for which I am hunting, I redouble my attention, so much so that, in a couple of days, I am the owner of half a score of tiny worms similar to the one which caused me such excitement. Each of them is lodged in a glass tube with its Chalicodoma grub.

The frog, for some time after its birth, is a fish with external gills, and other organs fitting it for an aquatic life, all of which are changed as it advances to maturity, and becomes a land animal. The mammifer only passes through still more stages, according to its higher place in the scale. Nor is man himself exempt from this law. His first form is that which is permanent in the animalcule.

The one process would seem to be not much more elaborate and intricate than the other. If the inherent qualities of matter have built up a solar system, they may have created, also, the first animalcule, the first fish, the first quadruped, and the first man.

Fine white sugar is sometimes floured pretty well; and brown sugar is sometimes made of a portion of good sugar with a cheaper kind mixed in. Inferior brown sugars are often full of a certain crab-like animalcule or minute bug, often visible without a microscope, in water where the sugar is dissolved.

The first impression one receives is, that the little creature has swallowed a great deal of sand, and is getting rid of it as speedily as possible: a habit he indulges in of darting into his hole at intervals, as if for fresh supplies, tends to strengthen this idea; but the size of the heaps formed in a few seconds shows that this cannot be the case, and leads to the impression that, although not readily seen, at the distance at which he chooses to keep the observer, yet that possibly he raises the sand to his mouth, where whatever animalcule it may contain is sifted out of it, and the remainder rejected in the manner described.

The reefs of the Pacific, the deep-sea soundings of the Atlantic, show that it is to the slow-growing coral and to the imperceptible animalcule, which lives its brief space and then adds its tiny shell to the muddy cairn left by its brethren and ancestors, that we must look as the agents in the formation of limestone and chalk, and not to hypothetical oceans saturated with calcareous salts and suddenly depositing them.

The first form of man himself "is that which is permanent in the animalcule"; and thence he comes to resemble successively a fish, a reptile, a bird, and the lower mammifers, before he attains his specific maturity.