128 CHEMICAL FOECE CHAP. X. §. H. 



" Take," he says, " two wide-mouthed glass phials of 

 equal size, 100 or 120 cub. centims.; pour 10 cub. 

 centims. of lime-water (eau de chaux) into each of 

 these phials. Prepare ten frogs in the manner of 

 Galvani ; that is, reducing them to a piece of spinal 

 marrow, thighs and legs without the paws, which 

 are cut in. order -to avoid contact with the liquid in 

 the phials. The cork of one of these phials is 

 provided with five hooks, either of copper or iron, 

 on which five of the prepared frogs are fixed. 

 Through the cork of the other phial are passed two 

 iron wires, bent horizontally in the interior of the 

 phial; the other five frogs are fixed by the spinal 

 marrow to these wires. This preparation must be 

 accomplished as rapidly as possible, and both the 

 phials be ready at the same Lastant, and great care 

 taken to avoid the contact of the frogs with the sides 

 of the phials or the liquid. When all is in readiness, 

 with a pile of two or three elements of Grove, and 

 with an electro-magnetic machine such as is em- 

 ployed for medical purposes, the five firogs suspended 

 on the two iron wires are made to contract. After 

 the lapse of five or six minutes, during which time 

 the passage of the ciurrent has been interrupted at 

 intervals in order to keep up the force of the con- 

 tractions, agitate gently the liquid, withdraw the 

 fi-ogs, close rapidly the phials, and agitate the liquid 

 again. You will then see that the lime-water con- 

 tained in the phial in which the frogs were contracted 

 is much whiter and more turbid than the same liquid 



