AND ANIMAL LIFE. 373 



had been tied by two ligatures in the hollow of the 

 ham, for popliteal aneurism. Not only the limb 

 was not chilled, which is what happens when the 

 course of the blood is intercepted, but the extrem- 

 ity, thus covered, acquired a heat much above the 

 ordinary temperature of the body. The same 

 apparatus, applied to the sound leg, did not pro- 

 duce this excess of heat, certainly* because the ful- 

 ness of life in that limb resisted the physical action"* 

 The explanation of this phenomenon is as 

 simple and satisfactory as the preceding in re- 

 ference to the experiments of HUNTER. An 

 artery had been tied in the leg, which would pre- 

 vent the limb from receiving its ordinary quanti- 

 ty of blood, and, consequently, the extremity 

 would become less- vascular, and the circulation 

 would likewise be irregular. On the application 

 of the sand bags, the sanguineous fluid would 

 be warmed, but the limb not possessing the usual 

 quantity, would, therefore, be in cap able of carrying 

 off the external heat to the same extent, and with 

 the same facility, as the greater quantity of blood 

 and its more regular circulation in the sound limb. 

 The extremity in which the arteries were tied, 

 from the great diminution which it suffers in 

 the proportion of the circulating fluid usually 



* Elements of Physiology, p. 45. Edit, quarto. Translated 

 by G. J. M. DeLus, M. D ; with Notes and a copious Appen- 

 dix by JAMES COPLAND, M, D. 



