(liver and zinc plates, of two inches fquare, with the metallic 

 communications, were under the tiiretlion of Mr. Pepys jun. 



The hrll feries of experiments was on frogs. The head 

 being fevered^ the Iciatic nervcj and the whole of the mufcles 

 of the thiglis and legs were laid bare ; a portion of the verte- 

 brae was cut away between the two nervesj leavinp- a. fmall 

 portion as a holding part. 



E\.p. r. The prepared limbs being held by the portion of 

 the vertebrjB, the mufcular part of the thigh or kaee was 

 brought bv the operator in contaft with the nerves. Coa- 

 tractions iallanlly took place without any metallic commu- 

 nication. 



Exp. II. Two prepared frogs were laid on the furface of* 

 <Irv Liirthen plate, the oppofite knees and the vertebnes 

 comniunicating ; as foon as a metallic arc was made by a 

 bow of wire, touching the nerve and mufcle of one of the 

 frogs, violent coiilr.iclions took place in both. 



E:p. III. Three prepared frogs were laid in the fame 

 order a? in Exp. II, only the parts of the animal were not 

 in contaft, except by a ftreak o'i water drawn by the finger 

 from one to the other acrofs the plate. As foon as a 

 metallic comnumication was made between the nerve and 

 Biufcle of one, all the three were thrown into motion, and 

 at the fame inttant. If glafs bars or metallic ones with a 

 fmall portion of wax on one end are ufed, no contraAions 

 are excited. ' 



Exp. IV. A prepared frog being held by the foot and a 

 portion of the vertebrae, and the other foot being brought in 

 contact with a filver waiter, fuch violent contradionrwere 

 excited as to caufe the limb apparently to leap along the plate. 



Exp. V. The operator having hold of the feet of a pre- 

 pared frog with one hand, and by welted hands communicat- 

 mg with three perlbns or more, the lailperfon completed the 

 circle by touching the veriebrse ; in doi^ig which contraAioa 

 iuftantly took place. 



Exp. \T. Two prepared frogs being laid in the order be- 

 fore mentioned on an earthen plate, a third was laid between 

 them reverfed, the toes touching the vcrtebrte of the two. 

 On a metallic cominunicatiun being made, liie two outward 

 ones violently contracted, without any fenfible eflecl on tfas 

 middle one, though it ferved as the coiidu6lor to one. 



The fecond feries was on a decapitated dog, in which the 

 troughs were made by a flexible metallic oondudor to com- 

 municate with the dcfircd part. 



Exp. V'll. A wire of tin communicating with one end of 

 the iroueh being introduced into ilie reitum of the anhnal, 

 the head bcin^ placed ajjaifjfi ih* fcvited trunk, the commc- 



nicatiun 



