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afterwards already Amphioxus animals appears arises Ascidian becomes beginning blood body brain called canal causes cavity cells classes cleavage closed common Comparative complete connected consequence consists course Descent developed distinct distinguished division dorsal egg-cell embryo entirely essential evolution existence explained fact Fishes formation four functions Gastrula germ germ-layers germ-vesicle groups grows hand head heart higher human important individual inner interest intestinal intestinal tube kidneys latter layer lies lower Mammals mass medullary membrane middle muscles natural notochord nutritive Ontogeny opening organs original outer passes period placenta Plate portion present primary primitive regarded relation remarkable represents secondary separate side significance similar simple single skin species spinal stage structure surface Theory tion true tube upper various ventral Vertebrates vesicle wall whole Worms yelk yelk-sac
Page 93 - We thus learn that man is descended from a hairy quadruped, furnished with a tail and pointed ears probably arboreal in its habits, and an inhabitant of the Old World.
Page 6 - This fundamental law, to which we shall recur again and again, and on the recognition of which depends the thorough understanding of the history of evolution, is briefly expressed in the proposition that the history of the germ is an epitome of the history of the descent...
Page 112 - ... the idealist scholar who closes his eyes to the real truth, or the priest who tries to keep his spiritual flock in ecclesiastical leadingstrings, can any longer tell the fable of the