CHAP. I. VASSALl EANDI. 9 



(d^crit dans le vol. v. de I'Academie des Sciences de 

 Turin, Dec. 19, 1790,) nne eleetricite positive; done 

 relectricite naturelle de I'air et des aliments reste 

 dans certaines parties du corps en abondance, tandis 

 que dans le meme corps il y a d'autres parties qui, 

 n'en ont pas la quantite proportionnee a leur 

 capacite." 



We shall find that the vast mass of facts accu- 

 mulated at this period by Galvani, Volta, and other 

 experimentalists, required for their full developement 

 a knowledge of a different order of phenomena 

 than those of ordinary electricity, or such as are 

 associated with static electricity. The developement 

 of the phenomena connected with current electricity 

 and that from chemical action, together with the 

 means of studying this form of electrical action, 

 namely, the galvanometer, were now required, 

 affording sufficient evidence for shewing, that the 

 different departments of science are so intimately 

 and mutually connected, that any advance in one 

 is necessarily dependent upon a corresponding 

 advance in another. 



Shortly after Galvani's death, Volta introduced 

 the pile, the voltaic battery; and as he could now 

 obtain the effects without the intervention of organs 

 ised substances, he was further confirmed in his 

 opinion as to the origin of the power being inde- 

 pendent of the animal body; in short, he denied 

 the existence of Animal Electricity . Men's minds 

 were now completely withdrawn from the subject of 



