264 NERVOUS FORCE. L.ECT. IVX* XV. 



menon consists, and by detailing the principal researches 

 which I at first made to determine its laws. Having pre- 

 pared a galvanoscopic frog, we place its nerve upon one or 



Fig. 20. 



Experiment illustrative of Induced Contraction. 



both thighs of a frog placed [prepared ?] in the ordinary 

 manner : then, by applying the two poles of a pile to the 

 lumbar plexus of this frog, we observe that when the 

 muscles of the thighs contract, convulsions simultaneously 

 occur in the galvanoscopic claw, whose nerve rests upon 

 the thighs in contraction. 



I have also ascertained, that this phenomenon likewise 

 occurs when we place the nerve of the galvanoscopic frog 

 upon the muscles of the thigh of a rabbit, and make these 

 contract by means of a current acting upon the nerve which 

 ramifies in the thigh. I have also observed contractions of 

 the galvanoscopic frog, without the employment of the 

 electric current to excite the contractions of the muscle, 

 producing the induced contraction ; the action of some other 



