Experiments upon the circulation of the blood, throughout the vascular system : on languid circulation, on the motion of the blood, independent of the action of the heart, and on the pulsations of the arteries / by the Abbe Spallanzani ; with notes, and a sketch of the literary life of the author, by J. Tourdes ; translated into English, and illustrated with additional notes, by R. Hall.

Lazzaro Spallanzani

Date:: 1801

Credit: Experiments upon the circulation of the blood, throughout the vascular system : on languid circulation, on the motion of the blood, independent of the action of the heart, and on the pulsations of the arteries / by the Abbe Spallanzani ; with notes, and a sketch of the literary life of the author, by J. Tourdes ; translated into English, and illustrated with additional notes, by R. Hall. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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$310 indication of it, and analogy cannot ])car us out in such a supposition. What other sense can supply the place of sight in the hat? Is it that of taste, smell, touch, or hearing? The touch !—However exquisite we may sup- pose this sense, it surely cannot inform the bat of the situation, sometimes at a considerable dis- tance of a ceiling, wall, AvindoM', &c. and, be- sides, if the extremities be covered o\'er with varnish, the animal will still fly in its usual manner. The smell!—This sense may, indeed, be of some utility. It is certain that a bat, deprived of its eyes, has a quicker perception of the proxi- mity of a living being, than of an inanimate body. Yet, if the nostrils be perfectly shut, it is found that the bat avoids as before the obsta- cles which intercept its progress. In this ex- periment, however, the animal soon perishes from the difficulty of respiration. The taste !—The partial, or total, destruction of the tongue, which is the principal instrument of this sense, does not prevent the bat from pro- ceeding in the same manner, as when it has both its eves. The$

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