50 CUEEENT FOBCE CHAP. IV. §. V. 



and the same in depth, capable of holding about five 

 ounces and a half of fluid, was used as the external 

 cell; a portion of the small intestines of a rabbit, 

 capable of holding half an ounce of fluid, was 

 suspended by threads, and formed the internal cell ; 

 the ends of the electrodes, to the extent of half an 

 inch, were bent at a right angle, and placed in each 

 cell, the other extremities being connected with the 

 galvanometer and mercurial cups, as in the experi- 

 ments on animals. Thus arranged, water at dif- 

 ferent temperatures was poured into each cell. 



Experiment 1. ^ 



Temperature of atmosphere ... 71 



Temperature of water in external cell 68 



Temperature of water in internal cell 120 



Slight vibrations of the needle. Every endeavour to 

 obtain a greater effect failed. The temperature of 

 the fluid in each cell was then ascertained by means 

 of a delicate thermometer. 



o 



Temperature of internal ceU . . . 105 

 Temperature of external cell ... 80 



Experiment 3. ^ 



Temperature of external cell . . . 160 

 Temperature of internal cell ... 68 



Vibrations as before ; and it was then found that the 



•"Temperature of external ceU was . 125 

 Temperature of internal cell ... 98 



