The Evolution of Man: A Popular Exposition of the Principal Points of Human Ontogeny and Phylogeny, Volume 1
Appleton, 1879 - Anatomy, Comparative
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afterwards already Amphioxus animals appears arises Ascidian becomes beginning body called canal cavity cells changes 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 furrow Gastrula germ germ-area germ-layers germ-vesicle groups grows hand head heart higher human important individual inner interest intestinal intestinal tube intestinal-fibrous kidneys larger latter layer lies lower Mammals mass medullary middle mouth muscles natural notochord nutritive yelk Ontogeny opening organs original outer parent-cell passes period placenta Plate portion present primary primitive vertebral protoplasm regarded relation secondary separates side significance similar simple single skin species spinal stage structure surface surrounded Theory tion true tube upper various ventral Vertebrates vesicle wall whole Worms
Page 91 - 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 4 - 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 110 - ... 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
Page 441 - See also blastostyle. blast'ula (Zool.). A hollow sphere, the wall of which is composed of a single layer of cells, produced as a result of the cleavage of an ovum.