Eugenio Rignano Upon the Inheritance of Acquired Characters
The book Eugenio Rignano Upon the Inheritance of Acquired Characters was written by author Eugenio Rignano Here you can read free online of Eugenio Rignano Upon the Inheritance of Acquired Characters book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Eugenio Rignano Upon the Inheritance of Acquired Characters a good or bad book?
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839. Headless but Otherwise Normal Monsters 113 nected by reciprocal actions with the absent parts, and therefore is not carried on by the reciprocal action of all the parts of the whole, one upon another. " 75 It is the same with headless monsters as with all monsters which lack entire parts of the organism but are nevertheless normal in the other parts. Because they show likewise that there does not exist any formative action exercised by the head, or by other parts, upon the rest of the orga...nism. While thus the head can be absent in development, the presence of certain other parts seems on the con- trary to be indispensable in headless omphalosite mon- sters: "When one studies/' writes Dareste, "headless, omphalosite monsters comparatively, one notes that the trunk is aknost complete in some cases but in others incomplete. And upon this fact is based Isadore Geoffrey Saint Hilaire's division of headless monsters into three different types: the true acephali, in which the thoracic region is as well developed as the abdominal region; the paracephali, which have only the abdominal region; and the mylacephali in which only the sacral region is pres- ent.
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