572 DR. J. W. CAPSTICK ON THE RATIO OF THE 







TABLE IT. 
Dp. Y- Bp. 
millims. 
200 1:180 2°878 
205 1:180 2°878 
285 1:189 2-751 
295 1:180 2:939 
400 1191 2°754 
400 | 1:188 2-814 
410 | 1:184 2896 
560 1:193 2°797 
| 610 1-190 8 3858 
630 | 1:192 2-818 

The values of 6 naturally diverge more widely from the mean than do those of y, 
but there is no longer any progressive change to be seen, and we may conclude that 
the ratio of internal to translational energy of a molecule does not depend on the 
average distance between the molecules. 
§ 2. Methylene Chloride. (CH,Cl,.) 
Table III. gives the results of five determinations of the vapour-density of 
methylene chloride. The first column gives the pressure to the nearest millimetre at 
which the experiment was made, the second column gives the temperature, and the 
third gives the specific gravity of the gas referred to air at the same temperature and 
pressure. 
Fig. 1 shows the curve plotted from the results. 


TABLE IIT. 
] 
| p: t p- 
| 
| 135 19-2 | 3-081 
155 18°6 3-087 
| 160 18:9 | 3-086 
| 199 18-6 | 3-094 
211 16-7 3:096 





