CONSTITUTION AND TEMPERATURE ON MAGNETIC SUSCEPTIBILITY. 253 



Material. Tenacity 



(dynes per square centimetre). 



Lead 016 x 10* 



Zinc 1-1 -1'5 xlO 9 



Glass (sometimes paramagnetic) . 0'3 0'9xlO* 



Diamagnetic. . <f Quartz 10x10* 



Copper 1-2-2-5 x 10 9 



Silver (wire) 2'9xl0 9 



-Gold (wire) 2'6xl0 9 



Aluminium O'f> r5xlO" 



Paramagnetic . ^ ' O'lG-0'38 x 10 9 



Glass (sometimes diamagnetic) . . 0'3 0'9xl0 9 

 Platinum (wire) 3 '3x10" 



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. ORGANIC Compounds Investigated in Parts I. and III. 



Substance. 



Benzene .... 

 Xylene .... 

 Chlorobenzene . . 

 Bromobenzene . . 

 Aniline .... 

 Acetophenone . 

 Benzophenone . . 

 Phenylhydrazine . 

 Pyridine .... 

 Nitrobenzene . . 

 Naphthalene . . . 

 Naphthylamine . . 

 Acetic acid . . , 

 Glycerine. . . . 

 Carbon tetra-chloride 



Magnetic 

 nature. 



diamagnetic 



Latent heat. 



Density. 



30 (calories per gramme) 

 39 

 30 

 20 

 21 

 33 

 23 

 36 

 22 

 22 

 35 

 22 

 44 

 42 

 4 



0-88 



1-12 

 1-49 

 1-02 



1-10 



1-10 



0-985 



1-19 



1-15 



1-05 

 1-26 



1-58 



Energy 



(ergs per cubic 



centimetre). 



1-1 xlO 9 



1-4 x 10 9 



1-3 xlO'-' 



0-9 xlO 9 



1-0 xlO 9 



1-6 xlO 9 



0-9 xlO'- 1 



1-1 xlO'-' 



1-7 x 10'-' 



1-9 xlO 9 



2-2 x 10 9 



0-26 xlO 9 



* See also Part III., p. 93, 



