Prof. Regnault on the Specific Heat of some Simple Bodies. 113 



M . . . . . 1308"! 5 



p 2^027 



T 97°*50 



& 19°*98 



A6' 3°*2159 



A 466-69 



C 01332 



The product of the specific heat by the atomic weight 344' 7 

 is 45*91, a number which is far too high. 



M. Dumas lent me another specimen of manganese prepared 

 by M. Brunner by th,e new method which this skilful chemist 

 has described (Comptes Rendus, vol. xliv. p. 630). The metal 

 formed two small ingots, which could be flattened under the 

 hammer, and took a beautiful polish with the rile. I neverthe- 

 less detected the presence in it of a small quantity of silicon : — 



M . 



. . 54? r -980 



54^-980 



V 



. . 0^-0515 



0= r *0515 



T . 



. . 97°*40 



96°-91 



& . 



. . 13°*10 



14°-25 



Ad 1 . 



. . 1°*2082 



1 °-2043 



A . 



. 466^*69 



466s r -69 



C . 



. . 0-1207 



01227 



] 



Vlean . 



0-1217. 



The product of the specific heat 0*1217 by the atomic weight 

 325*0 is 39'55, which is comprised within the specified limits. 



It may therefore be concluded that pure manganese is as duc- 

 tile as iron, and that its specific heat should be about 0'114. 



Nickel. 



In my first memoir " On the Specific Heat of Simple Bodies/' 

 I gave the specific heat of a specimen of nickel which had been 

 prepared by calcining at a strong furnace-heat oxalate of nickel 

 contained in a closed porcelain crucible, this being enclosed in a 

 crucible lined with charcoal. This specific heat is 0*10863; if 

 multiplied by the atomic weight 3500, which M. Dumas has 

 deduced from his last researches, the product 38*02 is obtained, 

 which agrees very well with the law of the specific heat of sim- 

 ple bodies. This proves the correctness of the formula assigned 

 to nickel compounds. 



Since then I have had occasion to determine the specific 

 heat on some specimens of nickel which had been prepared by 

 different methods. M. Rousseau lent me nickel obtained by calci- 

 ning at furnace-heat a mixture of oxide of nickel and sal-ammo- 

 niac enclosed in an earthen crucible. The metal formed two 



Phil. Mag. S. 4. Vol. 23. No. 152. Feb. 1862. I 



