Physics. — “On the solid state .” III. By J. J. vat* Laar. (Com¬ 
municated by Prof. H. A. Lorentz). 
(Communicated in the meeting of May 29, 1909). 
10. Before proceeding to the discussion of the course of the p-T- 
line liquid-solid, we shall first adduce some more material to prove 
our statements. For the values assumed by us of a , b, etc. (Comp. II 
p. 27) we shall namely successively calculate, besides the already 
calculated isotherm for T = 9 (see I and II), also the isotherms of 
100°, 128", 144°, 160°, 200° and 400° (all absolute temperatures), in 
order to show that on increase of temperature they really present 
the shapes and transitions indicated by us. (see the Plate of Part I, 
fig. 1—3). 
The accurate course of all these isotherms p = f{v) for T= 0, 
9, 100, etc. has been indicated on the Plate belonging to this paper. 
In view of the available dimensions- the scale of the pressure-values 
had to be somewhat reduced, which appears particularly for the 
critical isotherm ( T= 400), where p c = 400, i.e. 400 X 41,2 = 16480 
atms.— or after division by 100 (see II, p. 27 *)) =165 atms., 
which is rendered comparatively small in the drawing. The values 
of v have not been indicated further than v = S (300), so that the 
last maximum no longer falls inside the limits of the drawing. 
The isotherm T= 0 (comp. II, p. 34) is indicated by a line of 
alternate dashes and dots*). Further the locus of the maxima Hand 
of the minima C, which passes through the point of inflection /, 
where C and D coincide, has been indicated by an ordinary dotted line. 
We may remind the reader that the solid phase (for so far as it is 
realizable) always lies on the portion CD of the isotherms, the liquid 
!) So all the pressure-values of the following tables must still be multiplied by 
0,412; all the values of volume by 100. 
2 ) The values of p in the curvilinear part ED have been calculated from the 
equation p = -4g|*= 6400 — ~ [see II, p. 81, formule (8), which appa¬ 
rently applies to all the points between E and D, where <p = ^ = <x>, s0 that 
(p+«/^) ( Ab)~q 0 (see II, p. 31-32;]. The corresponding values of 0 may be calculated 
for this part from the relation v=b holding there (for p = (— * b > = 00 } 
