250 CALYANISM. 



The experi- A pile was accordingly formed by them In his manner : 

 mcnt repeated, gj^^y equal discs of walnut-tree were made, two inches 

 in diameter, having a raised edge of one eighth of an inch 

 high. These pieces were boiled in vinegar and with these 

 and round pieces of raw beet root and of a thick raddish, 

 (raphanus sativus of Linna3us,) a pile was constructed of 

 sixty couple of pieces of beet root and raddish, separated 

 by discs of wood, on the upper extremity of each of which 

 was poured by means of the border, a solution of the 

 acidulous tartrite of potash in vinegar. Lastly, at the 

 lower extremity of the pile was placed a leaf of cochlea- 

 ria, and at the upper extremity a double-band of blotting 

 paper, steeped in vinegar. Every thing being thus dis- 

 posed agreeably to the full description inserted in the 

 Moniteur ; frogs properly prepared for the action of this 

 pile, were placed with the leaf of cochlearia in contact 

 with their spinal marrow, and the band of paper with their 

 Ij ^jjj ^Qj ,^j.. muscles. Three frogs being thus successively and re- 

 cced, peatedly presented, shewed not the least motion, though 

 they were sufficiently sensible to be strongly agitated 

 when being supported on a knife to bring them near the 

 conductor of the pile, they were in contact with the blade 

 or silver mounting of the handle. After having made every 

 probable experiment with these frogs without success, 

 the pile was brought into communication with the electo- 

 micrometer, upon which also it produced no effect. The 

 same instrument was then presented to a pendulous pile, 

 constructed after the manner of M, Marechaux, composed 

 of 60 pair of new discs of copper and of zinc, with 

 the interposition of pieces of card, not moistened. The 

 intensity was about 180 degrees. At the same moment 

 the frogs which had been presented to the vegetable pile 

 were put into communication with this last, and they gave 

 no indicaHon of sensibility. 

 The electro mi- The Galvanic Society did not therefore obtain in the ex- 

 crometer more periments indicated by Dr. Baronio, the results which 

 frogs. ^® announced ; but they have served to show that the 

 electro-micrometer made use of, is still more sensible than 

 frogs, to shew the smallest effects of galvanism. 



