Sentence:  In its favour may be urged, I. That in healthy persons, in every case of increased action of the heart and arteries, a <WSD>sweating</WSD> takes place, and is, seemingly, the means of preventing the bad effects of such increased action. 
Meaning of the word marked with <WSD> tags:  The production and evaporation of a watery fluid called sweat that is excreted by the sweat glands in the skin of mammals.