364 
even the thermal movement. On account of the forces directed to 
(2 and to Q’ the molecule A would then experience a resulting force 
equal to a2, hence an increase of attraction equal to al/2—1). 
In the ‘Scientific Proceedings of the Royal Dublin Society” we 
have a series of data of Sypney Youne for the calculation of the 
value of a in the liquid state; he namely communicates the latent 
heat of evaporation at different temperatures up to very near the 
critical temperatures. 
The recorded quantity of heat refers to the so called external latent 
heat, and the quantity « only refers to the ‘néernal latent heat. But 
the latter can be calculated by multiplication by 
this is know, we know a, (d,-—d,). And d, and d, also having been 
given, the succeeding series of values of « can be calenlated, and 
a = 
therefore — for the different temperatures. I have found the following 
ay 
C 
series of numerical values for ether. For: 
4, a, aye 1 
i calculated with — —1—=1 ES 
a a a Vi: 
193 .… 1.025 
[92° 5,108 abt bree APG 5 IBY o> be 
POUCH Te Teken al OTRA Kr EE ii eee 
Lao PS WG EN AE EE AN 
ESO fF re: Wel OD mee LE Minder Poet 
WAAR Se ANP tt tk AD te ot eee 
WOL AET al her raar al EN PE EN 
L5Ow wet 1:28 At wns pst en ee eee 
140 . i 1,285 
BIOS TA eN AL ee fel cane, ERE 
120; 2 304 
aC De a 
LOO NED one ee PERRE 
TO rat elen ol Ye ADD 
es SALDI oet en MME Be al DEET 
TO es eee RE NES 
OED bh eee re ic oe erie: 
If we take into account that the determination of the thermal 
quantities is so much more difficult than the determination of dimen- 
sions, the agreement between calculation and observation can be 
called satisfactory, and we may assign a high degree of probability 
