86 THE ROYAL SOCIETY OF CANADA 
As an illustration, the value of ¢ for water at 0° C will be computed, 
and its value for a few additional substances at ordinary temperatures 
given, in order better to show its characteristics. On the last page will 
be given some additional values determined from two different formulas 
so that their differences may be compared. For the necessary data 
used in the computations. Ramsay and Shield’s ! values were used for 
the surface-tensions and for both vapour and liquid densities so far as 
possible. For vapour-pressures, Winkelmann’s Handbuch Vol. 3, 
Wärme, was used in many instances. In one or two instances other 
reliable tables were consulted. For water at 0°C, y = 73:2,¢ = 4-9 
x 10-°,e = 1,r = 1, = -46 X 980-6 X 13-6. From these values, 
z = 2-924 X 19 on computing its value from 
vo 
2 p & 

Now, if for brevity we take ¢ as 3- X 10° and substitute in the more 
general formula (D), we find that the largest value of r that affects 
Ar 

= _ and the 
r 10 
sum of the next two terms -0949, an increase of a little over 3 per cent. 
Hence when r = j¢~’, § = 2:83 X 10° instead of 2-92 X 19, the 
appreciably the value of ¢isr = 10° which makes 
value when r = 1. A similar percentage of variation for very small 
drops may be expected in all cases; but unless otherwise stated the 
values when r = 1 will be given. The following list contains the value 
of € for a few substances at the stated temperatures: 
Water at 0° C, 2-92 X {jp cm. 
Alcohol at 20° C, 2-43 X 49 cm. 
Ether at 20° C, 3-65 X 49% cm. 
Cs. at 19° -4C, 4-07 X 10 em. 
CCl, at 20° -C. 5-40 X 494 em. 
Benzol at 80° C, 3-42 X 19 cm. 
Before proceeding further with regard to the value of ¢ as thus 
determined, another aspect of the theory should be presented. Since 
© represents the ordinary vapour-pressure it may be expressed in terms 
of the general gas equation and must hold to the same extent that the 

‘Zeitschrift f. Phys. Chemie 12 (1893). 
