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"The sterility of first crosses between pure species, which have their reproductive systems perfect, seems to depend on several circumstances; in some cases largely on the early death of the embryo.
Consumption, on the other hand, to be legitimate, to be true consumption, must be reproductive of utility; for, if it is unproductive, the products which it destroys are cancelled values things produced at a pure loss; a state of things which causes products to depreciate in value. Man has the power to destroy, but he consumes only that which he reproduces.
If an individual lose a limb his offspring will not be without a corresponding limb, for the hereditary material is in the reproductive organs, and it is impossible to believe that the loss of the limb can remove from the hereditary material in the reproductive glands just that part of the germ plasm which was designed for the production of the limb.
The end in view being to prepare the young soul for the great battle of life, to put upon it the armor of a knight which shall be borne untarnished, the first instruction concerning the facts of the reproductive life may well be impersonal, poetical, beautiful, filling the mind with sentiment, not sentimentality, so that the mental vision of this side of life shall be one worthy of the glorious mind of man.
They, however, find rabbits enough, whose reproductive powers are limitless, to satisfy them; but the seals, which the dogs attack without any fear, manage to escape from them. The Mercury set sail on the 28th of April, 1821, to convey Freycinet and his crew to the port of Rio de Janeiro.
Then taking up its abode in that cell using it as a basis of operations, it proceeds to duplicate its previous performance, and so cell after cell is added, by the simple reproductive process of division and subdivision the primitive and elemental sex process until the mighty plant is built up. From the humblest vegetable organism up to the greatest oak the process is the same.
To put the matter still more definitely before the reader, we quote the following from a well-known scientist whose writings on the subject of evolution have had a wide circulation: "There are two bases on which species may be founded. Species may be based on form, morphological species; or they may be based on reproductive functions, physiological species.
From the standpoint of the nutritive individual it is better to be relieved of the reproductive task in order that there may be no interruption of its specialized activities for the good of all, but the entailed mortality is certainly disadvantageous to it.
There are to be recognized two modes of this effect produced by changed conditions on the reproductive system, and consequently on offspring. Simple arrest of development is one.
Previously to the age of eighteen or twenty, opportunity must be periodically allowed for the accomplishment of this task. Both muscular and brain labor must be remitted enough to yield sufficient force for the work. If the reproductive machinery is not manufactured then, it will not be later. If it is imperfectly made then, it can only be patched up, not made perfect, afterwards.
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