130 
ME. A. E. OXLEY ON THE INFLUENCE OF MOLECULAR 
(b) A Study of Naphthalene Compounds. 
Naphthalene , 
a -Naph thylamine, 
a-Bromonaphthalene , 
\/\/ 
\Br 
and 
In each case the liquid state is more diamagnetic than the crystalline state. The 
change of susceptibility on crystallization was 4 ‘5 per cent, for each substance, and 
took place at 80° C. with naphthalene, at 40° C. with a-naphthylamine (fig. 9k), 
and at 4° C. with a-bromonaphthalene. 
The rather low value of 9 X for naphthalene and its derivatives may be due to the 
two carbon atoms “condensed” in the naphthalene nucleus, which differ considerably 
in their chemical nature from the remaining carbon atoms of the naphthalene 
system. 
(c) Mercury. 
The liquid state was found to be more diamagnetic than the crystalline state, the 
value of 3 x /x amounting to 14 per cent. The curves are shown in fig. 14. These 
were obtained by first cooling the mercury with liquid air and observing the 
susceptibility as the temperature gradually rose. In the curve ABCD, when the 
point C had been reached, the mercury was re-cooled to a temperature just below 
that of the freezing-point ( — 37° C., as determined from the position of the dip) and 
afterwards to —85° C., and the points marked ® were obtained. Between —37° C. 
and 70° C. the diamagnetic property remained constant. 
Experiments on Substances which show a Liquid Crystal State. 
Cholesteryl Chloride , C 27 H 45 C1, and Para-azoxyanisol, CH 3 .0.<^ ^\N -N.\ j>.O.CH 3 . 
\ 
0 / 
In each case the diamagnetic property decreased during the transition from the 
