426 
DR. E. FRANKEAND ON A NEW SERIES OF 
from which the following values for x, y and z are derived : — 
X— -27 
?/= 17*06 
2= 3-62 
20-95 
The per-centage composition of the gases evolved by the action of heat upon iodide 
of ethyl and tin is therefore the following : — 
I. and II. 
III. 
Hydride of ethyl 
81-61 
81-43 
Olefiant gas 
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 following calculation : — 
C 4 H 5 H 81*61 X 1*03652 = 84-590 
C 4 H 4 16-82X *96742=16-272 
N 1*57X *96740= 1-519 
100-00 
102-381 
100 
1-02381 
Specific gravity found by experiment =1-0384 
The presence of hydride of ethyl and olefiant gas amongst the products of the 
action of heat upon iodide of ethyl and tin, shows that the combination of tin with 
iodide of ethyl is not the only reaction which takes place, but that a portion of the 
iodide of ethyl is also decomposed by the tin, with the production of iodide of tin 
and ethyl ; the latter body being transformed at the moment of its liberation into 
hydride of ethyl and olefiant gas, a catalysis to which this radical is so prone, 
2 C 4 H 5 I 
2 Sn 
C 4 Hs, H 
C4H4 
bSnl 
It was ascertained that protoiodide of tin was present amongst the solid products 
of the reaction. 
The large excess of hydride of ethyl exhibited in the above analysis, may have 
been caused, either by the greater solubility of olefiant gas in iodide of ethyl (a 
further and considerable amount of gas being expelled from the tube by the applica- 
tion 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 hydride of ethyl. 
C4H5I 
HO 
2 Sn 
l_fC,H5H 
j ISnO-fSnl. 
