and on the Isomeric Modifications of Selenium, 493 



Osmium, 



I owe to the kindness of M. Fremy the osmium which has 

 served for my experiments ; the metal was in the form of spongy 

 masses loosely aggregated, and of a bluish metallic lustre. The 

 following are the results of three experiments : — 



The equivalent of osmium, according to Berzelius, is 1244*2, 

 which would give to osmic acid the formula OsO^. The pro- 

 duct of the equivalent by the specific heat we have found to be 

 38*109 j it is therefore comprised within the two limits 36 and 

 41 which we have met with in other simple bodies. Hence the 

 value found for the specific heat of osmium verifies the formula 

 which chemists usually assign to the compounds of this metal. 



Rhodium. 



The rhodium on which I experimented formed part of the 

 beautiful display of MM. Desmoutis, Chapuis and Co., manu- 

 facturers of platinum ; it formed a simple forged cylinder, resem- 

 bling in appearance metallic platinum. In the experiment of 

 determining its specific heat, the cylinder was attached simply 

 by a very fine steel wire, the calorific capacity of which might be 

 neglected. 



M . . . 98gr-07 98gr-07 98^^-07 



According to Berzelius, the equivalent of rhodium is 652*1 ; 

 the product of the equivalent by the specific heat is thence 35-26; 

 this number is a little less than those which have been found 

 for other simple bodies ; but the difference is vei*y small, and 



