Medical and Physical Researches or Original Memoirs in Medicine, Surgery, Physiology, Geology, Zoology and Comparative Anatomy; With 160 Figures by Richard Harlan
Medical and Physical Researches or Original Memoirs in Medicine, Surgery, Physiology, Geology, Zoology and Comparative Anatomy; With 160 Figures by Richard Harlan PDF, ePub eBook D0wnl0ad
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.1835 Excerpt: ... Genera of North American Reptilia, and a Synopsis of the Species. There are few departments of natural science which, to American naturalists, have given rise to more investigation, than the history of the Reptiles of our widelyextended country. Within a very few years, most important facts have heen elicited, and many new and interesting species have heen added to a list, formerly extensive. The great obscurity and confusion peculiarly prevalent in the descriptions of authors who have written on this subject, though gradually dissipating, are by no means sufficiently cleared. To the student of Herpetology, whether general or local, a systematic arrangement of all the N. A. genera, with scientific descriptions of their species, cannot but be a desirable object. Brongniart's division of the reptiles into four orders, viz: Chelonia, Sauria, Ophidia, and Batrachia, is universally acknowledged, and justly esteemed. As all systems are arbitrary, we shall take the liberty of deviating from the numerical arrangement of this author, and commence with that Order which best comports with our present convenience. BATRACHIA. Characters of the Ohuer.--Heart with a single auricle and ventricle; the latter destitute of fleshy columns, and discharging the blood by one opening: skin naked, usually lubricated by a mucous secretion: no external organs of generation in the male: fecundation external: the eggs From ctTm--animals resembling frogs. are deposited in the water: the young are hatched in that element, and at first possess branchiae, which, in some genera, are persistent; in others, are absorbed when the lungs have acquired the proper degree of development: all destitute of true ribs, and possessing the faculty, more or less extensive, of changing their colours at wi...From reader reviews:
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