Physiology Animal And Mental Applied to the Preservation And Restoration of H
Physiology Animal And Mental Applied to the Preservation And Restoration of H
O S Orson Squire Fowler
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187 lations. But it is of the skin alone, as an agent in reducing animal heat, that we are at present to speak. u The sources of animal heat are not yet demonstrably ascer- tained ; but that it is constantly generated and constantly expended has been long known ; and if any considerable disproportion occurs between these processes, it is at the immediate risk of health. During repose, or passive exercise, such as riding in a carriage or sailing, the surplus heat is readily carried off by the in...sensible per- spiration from the lungs and skin, and by the contact of the colder air; but when the amount of heat generated is increased, as du- ring active exercise, an increased expenditure becomes immediately necessary. " 108. COLDS AND THEIR COXSEQUENG**' Colds are caused by, and even consist in, SUPPRESSED PER- SPIRATION ; nor in anything else. They are occasioned thus : cold always contracts. This is an established law of things. Hence, a sudden change of the temperature of the skin from heat to cold, causes its pores to contract ; many of them it closes.
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