412 HISTORICAL. COMPARATIVE. 



sented in a similar manner also in the writings of Hippocrates and Galen, was for 

 a long time the dominating one, and is found last in the writings of Cartesius and 

 Bartholinus (1667, "Flammula cordis"). The iatromechanical school attributed 

 the heat to the friction of the blood in the walls of the vessels. The iatrochemical 

 school, on the other hand, looked for the source of heat in fermentative processes 

 taking place in the blood through the entrance of absorbed articles of food. 

 Lavoisier was the first, in 1777, to make the combustion of carbon in the lungs 

 the source of heat. After the invention of the thermometer by Galileo, Sanctorius 

 in 1626 made the first thermometric observations on the sick, while the first 

 calorimetric observations were made by Lavoisier and Laplace in 1780. Compara- 

 tive observations have already been recorded on p. 382, and also with respect to 

 hibernation on p. 410. 



