278 
The accompanying diagrams exhibit the reduced coefficients ® and 
€ as functions of the reduced temperature ¢ within the region of 
observation for argon, that is, from t= 2, to t=0.8. The curves 
drawn through the circles refer to the special argon equation VII. A. 3, 
those through the triangles to the mean reduced equation VII. 1. and 
those through the squares to the special equation for carbon dioxide, 
Vesa) 
As the experimental data at present employed are very limited in 
scope we must, in the meantime, be somewhat chary of drawing 
conclusions as to the mutual actions of molecules when they come 
within each other’s immediate neighbourhood from a comparison of 
VIL. A.3. with the equations for the other substances shown in our 
diagrams. In the case of the ® coefficient the absence of data at 
small values of t is specially felt*), while as far as € and the special 
argon equation are concerned it is the absence of data towards the 
side of high densities. Equation VII. A.3 can, therefore, be regarded 
only as a first step towards the formation of the empirical equation 
of state for argon. 
COMMON ML. £. 3. rdt. A 
rom 10) 3 CONS L__ eV 
+350 t | 
100 ls 
EE 
1) Arch. Neérl. (2), 6, p. 874, 1901. Comm. N°. 74. 
2) We hope to be able to publish shortly some experimental results to supply 
this deficiency. 
