Convergence in evolution

Paperback | February 9, 2012

byArthur Willey

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1911 Excerpt: ... CHAPTER VIII Habitudes And Attitudes (bionomical Convergence) Identity of habitat occasions convergence of habits on the part of diverse animals. A great deal of this has been implied in the preceding chapters, but more remains to be said. The three principal functions of animal life, at least above the level of the sponge, are metabolism,1 reproduction, and neuration, the last being at once the master and the servant of the others, and leading on from a lower to a more advanced cerebration. The number of phyla or leading types of the animal kingdom is considerable, and there are only these three primary functions upon which to ring the changes. If there is one aspect of convergence more widespread than another, it is that of cerebral convergence, which is associated with the phenomenon of cephalisation or head-formation; and we can infer from this circumstance how hopeless must be the search for neural homology as 1 Metabolism comprises nutrition, respiration, and excretion. between parallel types of the animal kingdom. The cerebration of the ant is comparable, in several of its manifestations, with that of the higher mammals, but its evolution is distinct and its mechanism different. The comparison between the two forms is most profitable in the abstract; but it points away from homology, not towards it. Perhaps either direction leads round in a vicious circle to the same goal, namely, the point from which we started; but we may gather much by the way if we do not stray too far from the track and lose ourselves in a jungle of facts and speculations. National life is chiefly controlled by the desire to capture markets. Animal life is chiefly concerned with the occupation of feeding grounds. In general, any given feeding area can support a very mixed popula...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1911 Excerpt: ... CHAPTER VIII Habitudes And Attitudes (bionomical Convergence) Identity of habitat occasions convergence of habits on the part of...

Format:PaperbackDimensions:40 pages, 9.69 × 7.44 × 0.08 inPublished:February 9, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217823122

ISBN - 13:9780217823128

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