. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 524 COMPARATIVE PHYSIOLOGY. TBB MUSOnZJkR SSMm. Every one muat be aware how difficult it is to regulate hig movements when the limba are cold or otherwise deadened in sensibility. We know too that, in judgin^r of the muscular effort necessary to be put forth to accomplish a feat, as throw- ing a ball or lifting a weight, we judge by our past experience. It is ludicrous to witness
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 524 COMPARATIVE PHYSIOLOGY. TBB MUSOnZJkR SSMm. Every one muat be aware how difficult it is to regulate hig movements when the limba are cold or otherwise deadened in sensibility. We know too that, in judgin^r of the muscular effort necessary to be put forth to accomplish a feat, as throw- ing a ball or lifting a weight, we judge by our past experience. It is ludicrous to witness the failure of an individual to pick up a mass of metal which was mistaken for wood. In these facts we recognize that in the successful use of the muscles we are dependent, not alone on the sensations derived from the skin, but also from the muscles themselves. True, the muscles are not very sensitive to pain when cut; it does not, however, fol- low that they may not be sensitive to that different effect, their own contraction. Whether the numerous Pacinian bodies around joints, or the end-organs of the nerves of muscles are directly concerned, is not determined. FathologioaL—The teaching of disease is plainly indicative of the importance of sensations derived both from the skin and the muscles for co-ordination of muscular movements. In locomotor ataxy, in which the power of muscular co- ordination is lost to a large extent, the lesions are in the pos- terior columns of the spinal cord, or the posterior roots of )». > nerves, or both, and these are the parts involved in the trans- mission of afferent impulses. ComparatiTe.—The more closely the higher vertebrates are observed, the more convinced does one become that those sen- sory judgments, based upon the information derived from the skin and muscles, which they are constantly called upon to form are in extent, variety, and perfection scarcely if at all surpassed by those of man. Of course, sensory data in man, wi
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