479 
perceptibly affect the melting point of Sn I, shows that the solubility 
of Sn I, in this Jayer is very trifling. 
The SnI, layer saturated with Sn. SnI,, prepared by shaking 
molten SnI, with Sn, did not differ in colour from that which had 
been prepared by the net process and fused afterwards. A solubility 
of Sn in Sn I, did not make itself conspicuous by a darker colour, 
or as Lorenz ') deseribes it by a “Metallnebel”. The analysis of 
fused SnJ, which had been heated with Sn for some time at 
350°—-400° and then poured off from the molten metal, also did not 
differ perceptibly from that of pure Sn I,. The solubility of Sn in Sn J, is, 
therefore, exceedingly small. This is in agreement with the determi- 
nations of the solubility of Sn in SnI, by R. Lorenz’), who found 
that at 629° this is only 0.13°/, more than at 400°, so that, at 
350°, it may be safely taken as practically nd. 
7. The boiling point of Snl, was determined at 340°; Emicu has 
stated it to be at 341°. These determinations therefore tally, and the 
previous statement by Prrsonne (295°) must be rejected as being 
inaccurate. 
8. The boiling points of mixtures of I 
and Sn I, were determined in the apparatus 
drawn in Fig. 2. This consisted of a round- 
bottomed flask A of + 100 ce capacity, 
half way filled with the boiling mixture 
and protected by an asbestos case in the 
bottom of which a circular opening was 
made. The boiling flask can then be heated 
over the naked flame without danger of 
snperheating. 
To the flask was sealed a vertical tube 
surrounded by a jacket which was heated 
up to 140° by xylene vapour from 5. This 
prevented the vapour from A from forming 
a solid deposit in the tube; it conden- 
sed to liquid and was collected again in A. 
If, after long boiling, the iodine vapour 
had diffused too much towards the upper 
Fig. 2. part of the apparatus, the heating of A 
was suspended and all the iodine reentered the flask. The apparatus 
1) R. Lorenz. Die Elektrolyse geschmolzener Salze. 
2) R. Lorenz. Die Elektrolyse geschmolzener Salze II, 77. 
