INCREASE OF TEMPERATURE BY GALVANISM. J^9 



magpie and the bunting were killed sooner than the cock or 

 the pigeon. The difference was scarcely less striking be- 

 tween a large and a small frog, a beetle (scarabceus nasicor- 

 nis), and a wood-louse. It was not the same however in Exceptions, 

 all cases. The guinea-pig, though less, appeared to sup- 

 port heat a little better than a rabbit exposed to the same 

 temperature ; and the sparrow lived longer than the cock 

 and the pigeon. 



The results were not less modified by difference of or- Cold blooded 

 ganization. Frogs and cold blooded animals supported heaTbest!" "'* 

 heat much better in proportion to their size than hot blooded 

 animals. The larvae of beetles, leeches, and fresh-water Other excep- 

 snails (bulla? fontinales ), though still smaller., supported it ' 11S * 

 equally well. It was not the same with beetles in their per- 

 fect state, mole-crickets, and wood-lice, which were killed 

 much more quickly. 



(To be continued.) 



VIII. 



On the Increase of Temperature produced by the Galvanic 

 Action. By Mr. John Tatum, Jim. 



To Mr. NICHOLSON. 

 Dear Sir, 



IN the paper I sent you about two or three months ago, Additional ex- 

 on the rise of the temperature of water during its decompo- ^lvanism ^ 

 sition by galvanism, I proposed sending you the results of 

 other galvanic experiments I had made near a twelvemonth 

 since: but having mislaid the minutes I took during the ex- 

 periments, and various avocations preventing my repeating 

 these until the present time, is the cause of my not fulfilling 

 my intention so soon as I wished. 



In the following experiment 1 had two objects in view, 

 the one was, to ascertain the temperature to which the water 

 rose during its decomposition : the second, to confirm the 

 faint recollection I had of muriatic acid being formed in the 

 experiment alluded to : for which purpose I made use of two 

 troughs, each 26 plates, each plate 50 inches surface ; and 



two 



