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The general opinion of the people in Germany is that the country cannot be starved out, and this opinion is asserted with a great deal of patriotic fervor, particularly by newspaper editors. The leading scientists of the country, moreover, have taken up the question in a thoroughgoing way and investigated it in all its bearings. A little book ("Die Deutsche Volksernaehrung und der Englische Aushungerungsplan") has just been issued, giving the conclusions of sixteen specialists in various fields, which will be briefly summarized here. Economists, statisticians, physiologists, agricultural chemists, food specialists, and geologists have all taken part in producing a composite view of the whole subject; it is not a book of special contributions by individual specialists, but is written in one cast and represents the compared and boiled-down conclusions of the sixteen scholars.

But since adaptations point to _changes_ which have been undergone by the ancestral forms of existing species, it is necessary, first of all, to inquire how far species in general are _variable_. Thus Darwin's attention was directed in the first place to the phenomenon of variability, and the use man has made of this, from very early times, in the breeding of his domesticated animals and cultivated plants. He inquired carefully how breeders set to work, when they wished to modify the structure and appearance of a species to their own ends, and it was soon clear to him that _selection for breeding purposes_ played the chief part. But how was it possible that such processes should occur in free nature? Who is here the breeder, making the selection, choosing out one individual to bring forth offspring and rejecting others? That was the problem that for a long time remained a riddle to him.

The awakening of natural science in the sixteenth century brought the possibility of a concrete evolution theory nearer, and in the early seventeenth century we find evidences of a new spirit--in the embryology of Harvey and the classifications of Ray. Besides sober naturalists there were speculative dreamers in the sixteenth and seventeenth centuries who had at least got beyond static formulae, but, as Professor Osborn points out,[5] "it is a very striking fact, that the basis of our modern methods of studying the Evolution problem was established not by the early naturalists nor by the speculative writers, but by the Philosophers." He refers to Bacon, Descartes, Leibnitz, Hume, Kant, Lessing, Herder, and Schelling. "They alone were upon the main track of modern thought. It is evident that they were groping in the dark for a working theory of the Evolution of life, and it is remarkable that they clearly perceived from the outset that the point to which observation should be directed was not the past but the present mutability of species, and further, that this mutability was simply the variation of individuals on an extended scale."

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