Chemical Science. 403 



7. Specific Heat of Gases. — The following table of the spe- 

 cific heat of gases is from the Memoirs of M. M. Desormes 

 and Clement on Heat, published in the Journal de Physique. It 

 is given for equal volumes, at temperatures from 0° to 60 cen- 

 tigrade. 



Beiults sccoiding to M. M. 

 DeUroche and Desormes and 

 Gas. Inches. Beraid. Clement. 



Atmospheric air at 39.6 1.2396 1.215 



Ditto at 29.84 1. 1. 



Ditto at 14.92 0.693 



Ditto at 7.44 0.54 



Ditto at 3.74 0.368 



Do. charged with vapour of ether at 29.84 1 . 



Nitrogen at 29.84 1. 1. 



Oxygen at 29.84 0.974 1. 



Hydrogen , at 29.84 0.9033 0.664 



Carbonic acid at 29.84 1.2583 1.5 



Oxide of carbon , at 29.92 1.034 



Oxide of nitrogen at 29.92 1.3503 



Olefiantgas at 29.92 1.553 



Vapour of water at .102°.2 F. at 29.92 1.96 



The relative specific heat of water and air by weight is, ac- 

 cording to M. M. Delaroche and Berard, as follows : — that of 

 water being 1000., that of air was found, by three different me- 

 thods, tobe249.8— 281.3— and 269.7 .—M. M. Desormes and 

 Clement found that of air to be 250. 



M. M. Desormes and Clement have been searching after the 

 absolute zero, and are convinced that it is at 266''.66 below the 

 lero of the centigrade scale, or at — 446°. F. 



8. On Cadmium, by J. G. Children, Esq. 

 My dear Sir, — I take it for granted that the mode of separat- 

 ing cadmium from zinc, which Mr. Cooper, at page 192 of the 

 9th volume of the Journal of Sciences and the Arts, considers 

 " rather fallacious," is that suggested by myself in a former 

 Number, Vol. VI. p. 228. 1 do not know what " rather falla- 

 cious" means ; either the mode is effectual, or it is not. Neither 

 is it my business to inquire why " it did not succeed, in Mr. 

 2C2 



