256 M. Ch. Matteucci on tJte Chemical Composition 



d'A- d A.s d.!LE 



d^ dt ^ d^ dt d^ d 4>' 



db da da db da db 



d.lE 



d<p' d^' 

 do da 



d,ds ^,dj 



d (Z>, a) _ d(p dt d(p dt ds d^' 



dt ~~ db da da db da db 



ds d<p' 



db da 



dA^ d,^ dA^ 



— ^^ ^^ ^^ dt d<^' d(p' 



"" db da da db da db 



db da 



Hence ~^^j~ = 0, [b,a) = constant, 



as before, vol. xi. p. 495, when the more limited case was con- 

 sidered, the system being referred to rectangular coordinates 



XXXIX. Chemical Analysis of the Substance of the Electrical 

 Apparatus of the Torpedo. By M. Ch. Matteucci.'^ 



/^UR readers will find in the last Number an account of 

 ^^ M. Matteucci^s experiments on the Torpedo, translated 

 from an extract by M. Becquerel in the Comptes Rendus ; we 

 have since then received the November number of the Biblio- 

 thequeUniverselle,wh\ch. contains the entire memoir, and for the 

 completion of our former notice subjoin the following extract. 



M. Matteucci states : — I analysed the substance of the 

 organ of a moderate-sized torpedo after having removed all 

 the membranes, muscles, and great nervous trunks which are 

 attached to it. I commenced by determining the quantity of 

 water it contained, and proceeded in the ordinary manner. In 

 a first experiment I obtained from 1120 parts of the substance, 



* From the Bibliotheque Universelle de Geneve, No. 23, Novembre 1837, 

 translated by Mr. Francis. 



