j|i4 i^^''* Pepys*s Galvanic apparatus, 



taching thte fpine, being brought near the intercoflal mufclej 

 of a clog, while the affiftant who held the frog did, with his 

 other hand, touch the rnufcles ot" the thigh of the dog, (thus 

 forming a circle) ; in this fituation, the ticives lufpended ap- 

 proached, and came into contaA with the mulcle, as evidently 

 as a lilken thread is attra<Med bv feaiing-wax. 



2. The heart of a rabbit was exv'-iied to a6lion in a little 

 time after the animal was killed ; but vitality difappeared 

 much fooner than in the other mufcles : fo that this organ is 

 the primum, and not, as Harvey alferted, the ultivium mo'ieiis. 

 The lungs, liver, and fplecn could not be cxciied to a6lion, 

 even immediately after the animal was killed. 



3. The moft important faft of all was that of exciting 

 contractions by making a circle of nerves and mufcles of dit- 

 ierent animals, without any metallic exciter or conduftors. 



4. The head of an ox, recently decapitated, exhibited 

 aftonilhing effects : for, the tongue being drawn out by a 

 hook, fixed into it, on applying the exciters, in fpite of the 

 Itrength of the afliftant the tongue was retrafted, fo as to de- 

 tach itfclf, by tearing itfelf, from the hook : at the fame time 

 a loud noifc illued from the mouth bv the abforption of air, 

 attended by violent contortions of the whole head and eyes. 



After the exhibition of thcfe phaenomena of Galvanifm, 

 which, among other philofophers, particularly occupy the 

 attention of the FirftConful, the company partook of an ele- 

 gant dejeune and a converjaaione in Dr. Pearfou's houfe. 



XVII. Defcription of Mr. Pepvs's large Galva7ilc 

 Apparatus. 



Ml 



.R. PEPYS jun. has lately conftrufted the moR powerful 

 Galvanic apparatus that has, we believe, been yet produced, 

 of which we (hall endeavour to give our readers fome idea. 

 It confills of 60 pairs of zinc and copper plates difpofed in 

 two troughs coniiruiSlcd on Mr. Cruickfliank's plan, but 

 with fome accompanying arrangements which are extremely 

 convenient and ufeful. That our defcription mav be the bet- 

 ter underrtood, we refer to a view of the apparatus, Plate I, 



A A. The two troughs, each conlifling of 30 pairs of plates. 

 The plates are cemented into troughs maile of mahogany, 

 properly varniflied to ftand the aftion uf the fluids which 

 may be introduced into the cells between the plates. The 

 plates are each 6 inches fquare, or contain 36 fquare inches 

 of furface on each fide j and that they may be able to conti- 

 5 ' "^'« 



