EFFECTS OF GALTANISM ON ANIMALS. 371 



Sulphur 

 Carbon 



G. 



- 28-5 



G. 



196-5 



D.e. - 



- 160 



D.d. 



400 



Alumine 

 Silex 



Black oxide of iron, with a slight trace of 



manganese - D. /. - 72-5 



From which subtract for the vitriol 8*5 



64 - 64 



Vitriol of iron 



. A. c. 



- 18 



Sulphate of lime 



A. c. - 



15 



Magnesia 



- E. c. 



- 2-5 



Sulphate of potash - 



E. d. 



15 



Muriate of potash 



- E.d. 



- 5 



Water - 



E.a. 



107-5 



1012- 

 It is very possible however, that the quantity of some of 

 these component parts may be capable of being determined 

 with more accuracy. As to the excess of about one per 

 centj which the sum total shows, this may be considered as 

 of little importance in an analysis like the present. 



XII. 



On the Effects of Galvanism on Animals. In a Letter from 

 Mr. John Tatum. 



Dear Sir, 



iVlY two papers on galvanism having met with an inser- Galvanic expe- 

 tion in your Jourjial, induces me to send a third, contain- '■™"""- 

 ing galvanic experiments, some of which I presume will be 

 new to most of your readers, as I believe no one has per- 

 formed them but myself. 



After having killed two frogs, one by electricity, and Two frogs kill- 

 the other by immersion in carbonic acid gas, and dissected ■^^A^^'^^jy^^^'^* 

 tfaem in the usual manner, I endeavoured to excite them by other by fixed 

 a-galvanic trough of 50 plates, containing 350 inches sur- Je exckid.'^*' 

 face, but no muscular contractions ensued. I did not (as 

 2B2 is 



