Carpenter's principles of human physiology . had fallen to 6^ inches,and in the metatarsal of the Horse to 2^ inches per second. Vierordtestimated it at 10^ inches per second in the carotid of Man,* and at 2\inches per second in the metatarsal artery. Chauveau,f with a similarbut somewhat improved instrument, estimated the rapidity of the blood inthe carotid of the horse at 2028 inches per second during the systole of theheart, falling to 8*78 inches during the diastole. Volkmann found the rapidityof the current in the jugular vein of the dog to be 9 inches per second, andLudwig and Dogiel J f
Carpenter's principles of human physiology . had fallen to 6^ inches,and in the metatarsal of the Horse to 2^ inches per second. Vierordtestimated it at 10^ inches per second in the carotid of Man,* and at 2\inches per second in the metatarsal artery. Chauveau,f with a similarbut somewhat improved instrument, estimated the rapidity of the blood inthe carotid of the horse at 2028 inches per second during the systole of theheart, falling to 8*78 inches during the diastole. Volkmann found the rapidityof the current in the jugular vein of the dog to be 9 inches per second, andLudwig and Dogiel J found it to vary in the carotid of the rabbit from 4 inchesto 9 inches, and in the carotid of the dog from 14 to nearly 30 inches in thesecond. Cyon and Steinmann found that great diminution in the rapidity ofthe flow of blood followed section of the spinal cord, which was clearly dueto the consequent paralysis of the vaso-motor nerves, and the accumulationof blood in the veins of the viscera. The instrument adopted by M. Lortet§ Fig. Hsematochometer of Vierordt.—a and J, mouthpieces. * Physiologie, p. 110, 1861. + Archiv. Gen. de Med., vol. i. 1861, p. 113 ; and Jour, de la Phys., 1860, p. 695. X Ludwigs Arbeiten, 1867, p. 196. See also Notes on some Experiments on the Eate of Flow of Blood, and some other Liquids, through Tubes of Narrow Diameter, by Drs. Duncan and Gamgee, Journ. of Anat. and Phys., vol. v. 1871, p. 150; and Cyon and Steinmann, Bull, de lAcad. Imperiale de St. Petersbourg, t. viii. p. 55. § Eecherches snr la Vitesse du Cours du Sang, &c., Paris, 1868. MOVEMENT OF THE BLOOD IN THE ARTERIES. 325 Fig. 152.
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