30 
MR. J. W. CAPSTICK ON THE RATIO OF THE SPECIFIC HEATS 
remove the hydrogen. This is, of course, not essential, but prevents waste of 
propane in the liquefaction. 
Finally it was collected in a gas-holder, over caustic soda solution, to remove any 
sulphur dioxide still present. 
The liquefaction of the gas was carried out in the apparatus described under 
methyl chloride and by the same method, the soda-lime tube being omitted. 
In consequence of an accident only a single determination of the absolute density 
of the gas was made, according to which the specific gravity is 1'511 at 20°’2 and 
under a pressure of 260 raillims. 
To extend the result to the higher pressures a determination of the relative 
densities was made in the same way as for ethyl chloride. 
Table XYII. and fig. 12 show the results : 
Table XVII. 
p- 
V. 
t. 
t + 273 
pv 
209-24 
53-6 
19-4 
2607 
249-24 
45-0 
19-45 
2607 
293-30 
38-2 
19-5 
2610 
1 377-94 
29-6 
19-5 
2615 
1 574-10 
19-4 
19-5 
2626 
694-54 
16-0 
19-5 
2632 
Table XVIIl. gives the results for the ratio of the specific heats. The values of 
the specific gravity are taken from the curve above, an ordinate 2608 being taken to 
correspond to a specific gravity 1'511. 
