256 
MAJOE A. E. OXLEY ON THE INFLUENCE OF MOLECULAR 
Naph thalene — 
^ = 79-95 + 0-03657p-0-00000180jo2 
77== 10,100 atmospheres. 
Carhon tetra-chloride — 
-23-0 + 0-0350p-0-00000147p" 
77 = 11,900 atmospheres. 
EtltyJene di-hromide — 
^ = 9-85 + 0-0252p-0-00000125jo" 
77 = 10,000 atmospheres. 
Formic acid- 
P of as slum — 
Phosphorus — 
^ = 775 + 0-01276p-0-00000080p2 
77 == 7980 atmospheres. 
= 59-5 + 0-0146 -0-0000007p" 
77 == 10,000 atmospheres. 
^ = 43-93 + 0-0275p-0-00000050p'* 
77 == 27,500 atmospheres. 
Sidpliur, rhomhic-monoclinic* 
^ 95-4 + 0-03725p + 0'00000213j[)" 
77= —8700 atmospheres. 
Solid CO,- 
-56-8 + 0-01999jo-0-00000075/>' 
77= 13,300 atmospheres. 
These values, it is true, appear rather high when compared with those found from 
other considerations, but due importance must be attached to the difficulties of 
experimental work of this nature and to the fact that the experimental data have 
been extrapolated over a considerable pressure interval (several thousands of 
atmospheres). 
Comparing these results with those given on pp. 252 to 254 it is considered that a 
mean value of the intrinsic stress in diamagnetic crystalline media, viz., 2x 10® dynes 
per square centimetre is representative of the true order of magnitude of the forcive 
which binds the molecules in the space lattice of a crystalline medium. This implies 
that the energy per unit volume of the diamagnetic crystalline medium, in virtue of 
the crystalline grouping, is comparable with 2x10® ergs. 
* This transition of sulphur from the rhombic to the monoclinic form is accompanied by thermal 
0 % 
absorption. Since is positive the transition line for different pressures will be convex to the ^-axis. 
