576 DR. J. W. CAPSTICK ON THE RATIO OF THE 
§ 6. Ethylene Chloride (CH,Cl.CH,C)). 
Ethylene Chloride boils at 85°, and its vapour-pressure at ordinary temperature is 
so low, that small errors in reading the height of the mercury columns, or, in weighing 
the liquid, have too great an effect to allow a reliable curve to be drawn frorn 
the vapour-density determinations. Consequently these determinations were all 
made near the same pressure, and the mean of the results was used in the final 


calculations. 
The values found were as follows :— 
TABLE XI. 
P t. p 
42-9 23 3°460 
46°71 24 3°442 
4671 23°8 3437 
45:7 24-4, 3°448 
43°8 22°8 3:443 





To find the value of the correction factor a determination of the relative densities at 
three pressures was made with the apparatus described under Ethyl Chloride in 
my former paper. The experiment was made at 24°, with the result shown in 
Table XII. 


TABLE XII. 
| as 
| v. p- pv. 
| 
122-00 37°40 4566 
| 91:17 49°83 4543 
66°57 67:88 4519 




This gives 1'017 as the value of the correction factor at 45 millims. 
Finally, Table XIII. gives the details of the velocity of sound determinations. 
TABLE XII. 



| 
ld 
p | t 1 | l p TF ame 1 
| | 
4d 19-4. | 2356 | 48-92 3-446 | 1-017 1-144. 
42 | iss | 9846 | 48:90 = 1-135 
48 194 | 23:44 | 48:92 | 1133 




Mean .| 1:137 




