LECT. IX. GALVANOSCOPIC FROG. 177 



which will form the subject of the present lecture, also lead 

 us to the same conclusions. 



Electricity evolved also. It would be absurd to suppose 

 that the chemical actions of living beings, all of which de- 

 velop heat, and often light, would not be accompanied by 

 the production of electricity. This emission of electricity, 

 which we have now to demonstrate by all the evidence 

 proper to chemical truths, will form the subject on which I 

 am about to address you. 



Here is a very simple and easily executed experiment, 

 which proves the existence of an electrical current, which 

 is produced when we connect, by means of a con- 

 ducting body, two different parts of the same muscular 

 mass, belonging either to a living animal or to one recently 

 killed. 



Galvanoscopic Frog. A frog is prepared according to 

 the usual method of Galvani ; that is, we cut it through the 

 middle of its pelvis, separate carefully all the muscles of the 

 thigh, and divide one of the lumbar plexuses as it passes 

 out of the vertebral column. We then have a leg of the 

 frog united to its long nervous filament, composed of the 

 lumbar plexus, and of its prolongation in the thigh, that isl 

 to say, of the crural nerve. The frog, thus prepared, and 

 which I have called the galvanoscopic frog, is very useful 



Fig. 10. 



The Galvanoseopic Frog. 



in researches on the electric current. For this purpose we 

 introduce the claw of a frog mto a glass tube covered with 

 12 



