. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . FIG. 35.—Golden eagle, Aquila chrysaetus. man—a physicist, however, not a biologist—is Lord Kelvinstheory that living substance was brought to this earth fromcelestial regions by meteorites. A more acceptable theory isthat at some earlier geologic age the conditions of earth, atmos-phere, temperature, etc., were at one time of such a favorable LIFE, ITS PHYSICAL BASIS AND SIMPLEST EXPRESSION 45 nature that just that fortunate coincidence of all necessary
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . FIG. 35.—Golden eagle, Aquila chrysaetus. man—a physicist, however, not a biologist—is Lord Kelvinstheory that living substance was brought to this earth fromcelestial regions by meteorites. A more acceptable theory isthat at some earlier geologic age the conditions of earth, atmos-phere, temperature, etc., were at one time of such a favorable LIFE, ITS PHYSICAL BASIS AND SIMPLEST EXPRESSION 45 nature that just that fortunate coincidence of all necessary con-ditions and elements occurred which allowed C, H, O, N, to unitein those great, almost infinitely complex, molecules which com-pose the albuminous compounds whose existence is the only realchemical characteristic peculiar to living matter. But we have. FIG. 36.—African or two-toed ostrich, Struthio camelus. (Photograph by William Graham.) 46 EVOLUTION AND ANIMAL LIFE already indicated that the production of such compounds wouldnot necessarily be the production of protoplasm. What of thecomplex definitive physical organization of protoplasm onwhich we predicate so much of its capacity? The botanist Schaffhausen believes that water, air, and thenecessary mineral substances have been directly combined underthe influences of life and heat and have given birth to an
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