of the saturate vapours, and if this is sufficient to account for the 
differences found. 
If we leave quasi-association out of account, the following equations 
would hold : 
Rr a 
li v—b ae v? 
or 
Up EN v a 
AT nb eRe 
or 
vp a b 
RT vRT vb" 
For the reduction to which I shall subject the second member of 
the equation (a) I refer to my “Quasi association” and to my paper 
in the Proceedings of the preceding month. 
1 
(a) 
Ee ee ye ve Ju—l Ty 
nh. BETRAPTE 
ve vp RT, 1 ge Boge SEE 
though /; cannot be determined absolutely accurately, and this is 
a 
For the quantity —— I shall write ; and 
oe) ae 
fil 
also the case with s, we yet know —— pretty accurately. If we 
S 
1 
write — =m, we find: 
Tr 
a ve fiel il 
vRT v s sm 
. site oe Be 
In many cases SypNry Youre himself gives the value of a In 
the last column of his numerous tables he gives namely the ratio 
of the real to the theoretical density of the saturate vapour. By 
theoretical density he understands that which would correspond to 
' 
5 
, Pe 
the formula - 
RT 
= 1. Thus he gives for ether of 0° the value 1,028 
for this ratio. So this means that for saturate vapour of ether at 
av l ee Pris ; 
O° the value of EN is equal to 1,028 By substitution in equation 
(a) we have to investigate if: 
1 pdr b 
We LORE Tan v—b 
Now it has appeared (see These Proceedings p. 1211) that even at 
the critical volume the deviation of 5 from dy is only trifling. A 
