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action Alvan Clark American animals appeared astronomical barometer believe birds bivalve brain branchial brought called Carboniferous carmine color cause centre changes circumstantial cold color commissure connected creation Cretaceous Darwin discovery doctrine earth effect Eocene erected Europe evidence evolution existence fact feet fire flints forms ganglia ganglion gasteropods gives Herbert Spencer human Huxley hypothesis inches influence insects labor lecture less light living matter means ment millimetres Milton mind Miocene Mollusca mollusks mounds natural selection naturalists nerves nervous North observations observatory organs origin pangenesis period plants pollen posterior present produce Prof relation religion remarkable river Sherbourne S. W. Burnham scientific selenium side Society of Natural species storm stratified rocks supposed surface telescope temperature terrestrial animals theory things tion trees universe variation varieties whole