The Whence And the Whither of Man; a Brief History of His Origin And Development Through Conformity to Environment; Being the Morse Lectures of 1895
The book The Whence And the Whither of Man; a Brief History of His Origin And Development Through Conformity to Environment; Being the Morse Lectures of 1895 was written by author Tyler, John M. (John Mason), 1851-1929 Here you can read free online of The Whence And the Whither of Man; a Brief History of His Origin And Development Through Conformity to Environment; Being the Morse Lectures of 1895 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Whence And the Whither of Man; a Brief History of His Origin And Development Through Conformity to Environment; Being the Morse Lectures of 1895 a good or bad book?
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And yet a similar problem had to be solved in our bodies. But the vertebral column is not perfected by fish. The vertebrsB with few exceptions are hollow in front and behind, biconcave ; and between each two verte- brae there is a large cavity still occupied by the noto- chord. Thus these vertebrae join one another by their edges, like two shallow wine-glasses placed rim to rim. Only gradually is the notochord crowded out so that the vertebrae join by their whole adjacent surfaces. Even in high...est forms, for the sake of mobility, they are united by washer-like disks of cartilage. Biconcave 84: THE WHENCE AND THE WHITHER OF MAN vertebrae persisted through the oldest amphibia, rep- tiles, and birds. But finally a firm backbone and skull were attained. 2. The appendages. Of these we can say but little. The fish has oar-like fins, attached to the body by a joint, but themselves unjointed. By the amphibia legs, with the same regions as our own and with five toes, have already appeared. The development of the leg out of the fin is one of the most difficult and least understood problems of vertebrate compara- tive anatomy.
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