822 Intelligence and Miscellaneous Articles, 



we include in the circuit, the whole caloric of the circuit is exactly 

 accounted for by the whole of the chemical changes." The same 

 thing is reiterated in p. 105, in which I state, that in the electrolysis 

 of water a " transfer of latent heat, equal to 8°*27 per equivalent, 

 takes place from the battery to the electrolytic cell." 



I still maintain, therefore, and with additional proofs, that the law 

 claimed by Dr. Woods was proved by me in my papers from 1841 

 downwards ; and 1 now pass on to my paper of 1846, of which Dr. 

 Woods says, " Has it been published exactly as it is in their hands? 

 Perhaps the absorption of heat might not be shown in it at all." I 

 have fortunately the means of rebutting the injurious insinuation 

 conveyed by these words. I herewith send you the rough copy of 

 the translation of my original manuscrij)t which M. Mordacque, Pro- 

 fessor of the French language in this town, was so good as to make 

 me. You will observe at the head of it the attestation of M. Mor- 

 dacque, that it was prepared by him for me in 1845*. 



I observe that Dr. Woods, in endeavouring to clear himself of my 

 second charge, viz. that he endeavours to support his own claims as 

 an original discoverer by setting up one portion of my papers in con- 

 tradiction to another, merely reiterates the erroneous supposition he 

 advanced in p. 75. I have only therefore to refer to my last letter 

 in reply. Who is right, I or he, I leave with full confidence to the 

 determination of any one who will read my papers with candour. 

 I have the honour to remain. Gentlemen, 



Yours very respectfully, 

 James P. Joule. 



ON A LAW OF ELECTRICAL HEAT. BY DR. P. RIESS. 



To the Editors of the Philosophical Magazine and Journal. 

 Gentlemen, 



I was in hopes that my reply to the attack of Sir W, Snow Harris 

 would have been met by a substantial, tangible rejoinder, namely an 

 exact description of the experiments which Sir William regards as 

 incompatible with the law of electrical heat established by me. He 

 has, however, preferred to come forward, in the August Number of 

 the Magazine, with some scattered remarks, which are partly ines- 

 sential and partly unproved, and to produce testimonies which are 

 to confute me. I will briefly examine these observations in the order 

 in which they occur ; but I must for the future take care, that ob- 

 jections which I leave unanswered are not on that account regarded 

 as well founded. 



The author complains of the tone and mode of expression which 

 prevail in my short reply to his long attack. I will not appeal to 

 the fact that my letter, like the present one, was written in German 

 and translated in England ; for if one expression appears strength- 



* We have comtMored the French translation with the paper published 

 in the Magazine for 1852, and find them to be exaetly the same. — Eds. 

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