. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . the structuralresemblances existing in eachindividual in great groups oforganisms. All organismshave the impulse to repro-duction. All are forced tomake concession after con-cession to their surroundingsand in such concessions prog-ress in life consists. Atlast each organism or eachalliance of organisms is dis-solved by the process ofdeath. The unity in life is thennot less a fact than thediversity. However greatthe emphasis we lay on in-dividuality or di
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . the structuralresemblances existing in eachindividual in great groups oforganisms. All organismshave the impulse to repro-duction. All are forced tomake concession after con-cession to their surroundingsand in such concessions prog-ress in life consists. Atlast each organism or eachalliance of organisms is dis-solved by the process ofdeath. The unity in life is thennot less a fact than thediversity. However greatthe emphasis we lay on in-dividuality or diversity, theessential unity of life mustnot be forgotten. Whateversolution we may find to theproblem of the origin ofspecies, must also explainwhy species and individualsmay be so much alike in alllarge details of know the origin of specieswe must also know whyspecies admit of naturalclassification. Why is varietyin life based on essentialunity? From the fundamental unity of the species of to-day, wemay infer the similar unity of species in past time. From theknowledge of variety in unity comes the likening of species of. FIG. 13.—Starfish ) (After 24 EVOLUTION AND ANIMAL LIFE animals or plants to the separated twigs of a tree, of whichthe trunk is more or less concealed. We can only predicateand define species at all, says Dr. Elliott Cones, from the merecircumstance of missing links. Our species are twigs of a treeseparated from the parent stem. We name and arrange themarbitrarily, in default of a means of reconstructing the wholetree, in accordance with natures ramifications. To continue
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