Organic Bodies containing Metals, 163 



cially if the vapour from the heated iodide of stansethylium be 

 inhaled ; yet this compound can scarcely be said to be volatile at 

 common temperatures, since a few grains may be exposed to the 

 air for several weeks without any appreciable loss of weight. 



Oxide of Stancethylium. — In contact with solutions of the 

 alkalies, iodide of stansethylium is immediately decomposed, 

 oxide of stansethylium and an alkaline iodide being formed ; with 

 solutions of potash and soda the oxide of stansethylium dissolves 

 in an excess of the precipitant, but is reprecipitated, unchanged, 

 by cautious neutralization of the alkaline solution ; with solution 

 of ammonia the precipitated oxide remains undissolved on the 

 addition of an excess of the alkali ; a quantity of the oxide of 

 stansethylium, prepared in this latter manner, was heated for a 

 few minutes with an excess of ammonia, thrown on a filter and 

 washed with distilled water until all iodide of ammonium was 

 removed. Submitted to analysis it yielded the following results : — 



I. '3497 grm., burnt with oxide of copper, gave '3218 grm. 

 carbonic acid and '1630 grm. water. 



II. '7296 grm., decomposed by nitric acid and ignited, gave 

 •5778 grm. peroxide of tin. 



III. '9218 grm. gave, when similarly treated, '7239 grm. 

 peroxide of tin. 



These numbers agree closely with the formula C'* H^ SnO, as 

 is seen by the following comparison : — 



100-00 



Analyses Nos. I. and IV. of iodide of stansethylium also clearly 

 show the transformation of the iodide into the oxide of stansethy- 

 lium by ammonia ; in analysis No. I. 1-6806 grm. of iodide of 

 stansethylium gave -7263 grm. of oxide of stansethylium, and in 

 analysis No. IV. 2*0980 grms. of the iodide yielded -9218 grm. 

 of the oxide of stansethylium. Hence 



Calculated. Found. 



I. II. 



100 parts of iodide of stansethylium 1 

 yield of oxide of stansethylium j" ^^ ^ 



The numbers obtained by experiment correspond sufficiently 



