36 On the Composition of C/ielidonin and Jervin. 



1. 0-370 jervin dried at 100° gave 0-319 water, and 1-0165 

 carbonic acid. 



2. 0-203 gave 0*178 water and 0-555 carbonic acid ; 0-398 

 at 17'-8 centigrade, and 27" 6'" of barometer gave l?-* 

 cubic centimeters of nitrogen gas = 16-11 centigrade, and 

 at 0-* centigrade, and 28 Rhenish inches of barometei*. 



This gives for the composition of jervin in 100 parts, 

 I. 



Carbon 75-96 75-60 



Hydrogen ... 9-57 9-74? 



Nitrogen 5-38 5'3B 



Oxygen 9*09 9-28 



100-00 100-00 



To find the atomic weight the platinum in the double salt 

 was determined by burning. It melted, became black, and 

 burned away widi flame. 



I. 0-1237 gave O'OIS of metallic platinum = 14*55 per 

 cent. As the atomic weight we deduce for the double salt 

 the number 8476-83; for the muriate of jervin 6358-03, and 

 for the anhydrous base 5902-90. 



II. 0-094 of die double salts gave 0-0135 of metallic pla- 

 tinum = 14*33 per cent. Hence the atomic weight of the 

 double salts 8588-8 1 ; of the muriate of jervin = 6470-01, 

 and of the jervin = 6014-88. 



If we calculate after these data the formula of the jervin, we 

 get the following theoretical composition : — 



In 100 parts. 



60 at Carbon 4586*10 76*41 



90 — Hydrogen .... 561*57 9-36 



4 — Nitrogen 354-08 5*89 



5 — Oxygen 500*00 8*35 



1 at Anhydrous jervin = 6001*75 100*00 



4 — Water = 449*92 6-97 



1 at Crystallized jervin = 6451-67. 

 For the platinum double salt we get the following com- 

 position : — 



Calculated. Obtained. 



]. 2. 



1 efju. muriate of jervin 6456*88 75-29 75*34 75*01 

 1 -chloride of plaO 

 tinum .... J 



1 equ. muriate ofl — — — 



platinum and ^ s 8575-68 100-00 100 00 100*00 

 jervin .... J 



