1138 
entirely arbitrary and always varying. A regular arrangement as 
would be the case for cubic distribution, when in every molecule, 
3 directions could be pointed out at right angles to each other 
according to which they would be surrounded by 6 neighbouring 
molecules placed at equal distances, while in all the molecules these 
three directions and distances would be the same, is altogether 
inconceivable. This is a fortiori the case with the other mentioned 
regular arrangements, according to which it would be possible in 
every molecule to point out several directions inclosing angles of 
60°, according to which they are surrounded by other molecules. 
This would only not be absurd for stationary molecules, and then 
v, is not equal to 6,, but v,>6,. Now it might appear that the 
bi, introduced by me would really have to be 4,. I introduced the 
biim When I diseussed the ratio of the greatest liquid density to the 
critical density, and made use for this purpose of the rule of the 
rectilinear diameter. This greatest liquid density occurs for 7’ = 0, 
and would therefore seem to hold for stationary molecules. This, 
however, is only seemingly in my opinion. Below 7’ equal e.g. to 
1 
| 
Ole 7). this rule cannot be verified, but apart from its appro- 
ximative character this rule is extrapolated. It is then taken for 
granted that what we have observed over a wide range of tempe- 
rature, will also hold outside these limits. And I too have assumed 
this in the determination of wijn. All this refers to a volume in 
Uk 
which moving molecules occur. And so, if we put — = 2(1 + y), 
Vlim 
te bas 
the value 0);, in the relation of —- = 2(1 + y) =r —- is also that 
Vlim lim 
which holds fer moving molecules. If observations could also be 
made at 7'=0, the volumes which are smaller than that in which 
the curve touches the line v = 6, could be realized. And I do not 
doubt at all that in the immediate neighbourhood of 7’= O the rule 
of the rectilinear diameter would entirely fail. 
Let us summarize the foregoing. There is only one point in which 
the d-curve has a point in which vb. This takes place ata value 
of 6 which we have called by, and in which, because v = b, the 
ee nev de 
value of the pressure is infinitely great. In this point aaa 1. Thenin; 
Vv 
dp 2a db 
dp = baat = dv 
a ees 
