110 Prof. Regnault on flic Specif c Heat of some Simple Bodies. 



solved in boiling water ; and the solution gave, by boiling, the 

 crystallized chloride of rhodium and sodium. From this salt, 

 treated as before, metallic rhodium was obtained, which was 

 compacted by percussion. 



Osmium. 



The osmium consisted of a single cylinder strongly compacted 

 by hammering. I only made one determination, the results of 

 which are as follows : — 



M 204g r -59 



p ls r *5048 



T ....... 97°'77 



& 18°-71 



Ad' l°-3338 



A 466-69 



The specific heat of osmium, as deduced from this experiment, 

 is C = 003113. This number scarcely differs from the number 

 0-03063, which I obtained for osmium prepared by M. Fremy 

 (Ann. de Chim. et de Phys. 3rd series, vol. xlvi. p. 162). The pro- 

 duct of the equivalent of osmium, 1244*2, into its specific heat, 

 0*03063, is 38*11 ; osmium therefore completely follows the law 

 of specific heats of simple bodies, and the formula of osmic acid 

 is Os O 5 , as is generally admitted. 



Rhodium* 



The rhodium on which I experimented in 1855 was prepared 

 by Mi Chapuis, but contained small quantities of one of the pla- 

 tinum-metals with high equivalents. The specific heat of rho- 

 dium was accordingly found somewhat too low, 0*05408 ; for 

 multiplied by its equivalent 652*1, it gives the product 35*26. 

 The new specimen proceeds also from M. Chapuis, who applied 

 himself to purify it as completely as possible. The metal formed 

 a single cylinder strongly compacted by hammering. The fol- 

 lowing are the results of the experiments : — 



M . . . 200^*31 200^*31 



lg r *5048 lg r *5048 



98°*15 97°*50 



19°*64 19°-97 



2°*1138 2°*0917 



466s r *69 466^*69 

 0*5522 0*5532 



P • 

 T . 



6' . 

 A6" . 

 A . 

 C . 



Mean . . . 0*05527. 



The product of this specific heat by the equivalent 652*1 is 

 36*04. The product is somewhat too low, owing probably to 

 the presence of a little iridium. 



