. Animal biology. Biology; Zoology; Physiology. DEVELOPMENT OF BIOLOGY 475 mutability of species; and by the theory of natural selection on the basis of slight adaptive variations resulting in the survival of the fittest in the struggle for existence — which, strange to say, Darwin and Wallace (1822-1913) reached simultaneously and independ- ently— Darwin "made the old idea current intellectual ; (Figs. 236, 239, 311, 312.) To-day, as we know, no representative biologist questions the fact of evolution — "evolution knows only one heresy, the denial. Fig. 311. —Alfred Russel
. Animal biology. Biology; Zoology; Physiology. DEVELOPMENT OF BIOLOGY 475 mutability of species; and by the theory of natural selection on the basis of slight adaptive variations resulting in the survival of the fittest in the struggle for existence — which, strange to say, Darwin and Wallace (1822-1913) reached simultaneously and independ- ently— Darwin "made the old idea current intellectual ; (Figs. 236, 239, 311, 312.) To-day, as we know, no representative biologist questions the fact of evolution — "evolution knows only one heresy, the denial. Fig. 311. —Alfred Russel Wallace. of continuity" — though in regard to the factors involved, there is much difference of opinion. It is possible that we shall have reason to depart widely from Darwin's interpretation of the effective prin- ciples at work in the origin of species, but withal this will have little influence on his position in the history of biology. The great value which he placed upon facts was exceeded only by his demon- stration that this "value is due to their power of guiding the mind to a further discovery of ; The Origin of Species brought biology into line with the other inductive sciences, recast prac- tically all of its problems, and instituted new ones. Darwin beauti- fully and conservatively expressed this new outlook on nature in the historically important concluding paragraph of his epoch- making work:. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company
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