Proceedings of the Boston Society of Natural History, Volumen3

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Boston Society of Natural History., 1851

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Página 204 - Three causes for this jet had been assigned, namely, the water taken into the mouth with the food of the animal, the water in the nasal cavities, and the secretions of the bronchial tubes. As it appears in the form of a sudden discharge of vapor, he thought a fourth explanation might, be added, the sudden rarefaction of the air when inhaled, followed by a sudden condensation when emitted. He thought it was partly due also to the small quantity of water which entered the outer extremity of the nasal...
Página 98 - Annual Report of the Regents of the University, on the condition of the State Cabinet of Natural History, and the Historical and Antiquarian Collection annexed thereto.
Página 183 - He also examined the connection of respiration with the circulation : in Vertebrata, the gills are found between branches of the blood system ; in Invertebrata, the chyliferous system is acted on by the respiration ; the gills of fishes, then, cannot be compared to the gills of Crustacea, Articulata and Mollusks. No gills are connected with the chymiferous circulation ; animals having this circulation have no true respiration ; they have only tubes to distribute freely aerated water to the different...
Página 204 - As it appears in the form of a sudden discharge of vapor, he thought a fourth explanation might, be added, the sudden rarefaction of the air when inhaled, followed by a sudden condensation when emitted. He thought it was partly due also to the small quantity of water which entered the outer extremity of the nasal passages. He had succeeded in imitating the appearance in question, by introducing a small quantity of water into the end of a syringe and suddenly expelling it, with the body of air behind...
Página 50 - A Descriptive Catalogue of the Anatomical Museum of the Boston Society for Medical Improvement, by JBS Jackson, MD 8vo.
Página 299 - Sciuridte are but modifications of a primitive type squirrel, we should expect to find certain parasites common to all, with a uniform specific character, without widely separated genera, which, as far as his experience goes, is not true ; for though in many cases certain species of parasites are common to the whole family, yet there is an evident tendency for each species of the higher animals to have its own peculiar species of parasites. Though we can easily imagine that the same species may be...
Página 300 - ... in which they live, all lead to the conclusion of their local creation in their present habitats. The relations of parasites afford considerable proofs against the hypothesis that the differences of terrestrial conditions have caused the differences in animals. We could not suppose that the lice living on European birds would be different from those of the analogous species of American birds, if they arose from a common stock ; their parasites ought to agree as to species. This is not the fact...
Página 332 - Lake Champlain. As the deposits in these localities do not in the opinion of the geological party to which he was attached belong to the true drift, they had...
Página 351 - So important is the substance deemed, that a few years since the British government sent commissioners to Estremadura in- Spain, for the purpose of exporting it to England, and Prof. Daubeny made a report on the subject, the result of which was, that it did not occur...
Página 201 - Phoazna communis of Europe, proves upon examination to be a distinct and hitherto undescribed species. In P. communis the temporal groove of the skull is narrow and oblong ; in the American species it is as wide as long. The general form of the skull is also different. In the European species the posterior surface is nearly vertical, in the American it is much curved. The teeth of the American species, although agreeing in general with those of the European in form, are grooved on the broad faces...

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