Organic Bodies containing Metals. 169 



from which the following values for x, y and z are derived : — • 



x= '27 ' 

 2/=17-06 

 2= 3-62 



20-95 



The per-centage composition of the gases evolved by the action 

 of heat upon iodide of sethyle and tin is therefore the following;-— 



I. and II. III. 



Hydride of sethyle . . 81-61 81-43 



Olefiantgas .... 16-82 17-28 



Nitrogen 1-57 1-29 



100-00 100-00 



This result is also confirmed by the determination of the 

 specific gravity of the gaseous mixture, as is seen from the fol- 

 lowing calculation : — 



C^H^H . . . 81-61x1-03652=84-590 



C^H'* ... 16-82 X -96742 = 16-272 



N ... 1-57 X -96740= 1-519 



100-00 102-381 ^-^.Q^gg J 



100 



Specific gravity found by experiment . . =1-0384 



The presence of hydride of sethyle and olefiant gas amongst 

 the products of the action of heat upon iodide of sethyle and tin, 

 shows that the combination of tin with iodide of sethyle is not 

 the only reaction which takes place, but that a portion of the 

 iodide of sethyle is also decomposed by the tin, with the produc- 

 tion of iodide of tin and sethyle ; the latter body being trans- 

 formed at the moment of its liberation into hydride of sethyle 

 and olefiant gas, a catalysis to which this radical is so prone, 



on^TTSTl rC H , H 



^^^ J USnl 



It was ascertained that protoiodide of tin was present amongst 

 the solid products of the reaction. 



The large excess of hydride of sethyle exhibited in the above 

 analysis, may have been caused, either by the greater solubility 

 of olefiant gas in iodide of sethyle (a further and considerable 

 amount of gas being expelled from the tube by the application 

 of a gentle heat), or by the presence of moisture in the materials, 

 which would give rise to the formation of oxyiodide of tin and 



Phil. Mag. S. 4. Vol. 5. No. 31. March 1853. N 



