CONSTITUTION AND TEMPERATURE ON MAGNETIC SUSCEPTIBILITY. 253 
Diamagnetic, 
Paramagnetic . < 
Material. 
Tenacity 
(dynes per square centimetre). 
Lead. 
0-16 X I(U 
Zinc. 
ri-rsx 1(P 
Glass (sometimes paramagnetic) 
0-3-0-9X 10" 
Quartz. 
lOx 10" 
Copper. 
1-2-2-5X 10" 
Silver (wire). 
2-9 X 10" 
Gold (wire). 
2-6 X 10" 
Aluminium. 
0-6-1-5X 10" 
Tin.. 
0T6-0-38X 10' 
Glass (sometimes diamagnetic) . 
0'3-0-9x 10" 
Platinum (wire). 
3-3 X 10" 
We may conclude that the intrinsic stress due to the local molecular held, 
calculated as above, gives a satisfactory interpretation of the ultimate tensile strength 
of crystalline media, as observed experimentally, irrespective of the nature of their 
magnetic property. 
The energy associated with the medium, in virtue of this intrinsic pressure of 
crystallization, is consistent to the right order with the value of the latent heat of 
fusion of the material.* 
The energies per cubic centimetre of various diamagnetic and paramagnetic media, 
calculated from the latent heats of fusion, are given below ;— 
1. Oeganic Compounds Investigated in Parts I. and III. 
Substance. 
Magnetic 
nature. 
Latent heat. 
Density. 
Energy 
(ergs per cubic 
centimetre). 
Benzene . 
diamagnetic 
30 (calories per gramme) 
0-88 
1-1 xl09 
Xylene. 
J J 
39 
— 
— 
Chlorobenzene . . . 
30 
112 
1-4 X10« 
Bromobenzene . 
20 
1-49 
1-3 xl09 
Aniline. 
21 
1-02 
0-9 xl09 
Acetophenone . . . 
33 
— 
■— 
Benzophenone . 
?? 
23 
1-10 
1-0 X 100 
Phenylhyclrazine . . 
51 
36 
1-10 
1-6 xlO® 
Pyridine. 
51 
22 
0-985 
0-9 xlOO 
Nitrobenzene . . . 
22 
1-19 
] • 1 X lO'o 
Naphthalene.... 
51 
35 
1-15 
1-7 xlOo 
Naphthylamine. 
51 
22 
— 
— 
Acetic acid .... 
44 
1-05 
1-9 xlO® 
Glycerine. 
55 
42 
1-26 
2-2 X 100 
Carbon tetra-chloride . 
55 
4 
1-58 
0-26 X100 
* See also Part IIL, p. 93, 
