APPENDIX. 
Since the above paper was read, I have 
found that the intensity of Mr. Grove’s voltaic 
arrangement may be increased in the ratio 
100:118, by the use of a mixture of peroxide of 
lead and sulphuric acid instead of nitric acid. 
Hence it appears that the intensity of the nitric 
acid battery is considerably less than the intensity 
due to the union of the positive metal with 
oxygen. The calculations at p. 99—101 are 
therefore built upon erroneous data, and must be 
laid aside. 
I have once or twice made use of the terms 
“latent heat,” ‘ caloric,” &c., but I wish it to be 
understood that those words were only employed 
because they conveniently expressed the facts 
brought forward. I was then as strongly attached 
Q 
