CONSTITUTION AND TEMPERATURE ON MAGNETIC SUSCEPTIBILITY. 
was not always the same—this may be explained by the slightly different rates of 
cooling in the different experiments—for the outer layers of the sphere of benzene 
crystals will melt first, and these may have reached the stage where an increase of 
temperature causes a rise of x , while the inner layers of the sphere are still falling to 
pass through the pit. 
This fall and rise of x may be connected with the perfect symmetry of the benzene 
molecule. 
7-6 
74 
72 
70 
— Temp. (°C) 
FIG. II 
N 
Pyridine. I I 
The curve for the phial filled with pyridine was parallel to the curve for the empty 
phial throughout a range of temperature, 20° C. to-150° C. In liquid air, the 
pyridine passed into a stiff jelly state, as in the case of benzaldehyde. On slightly 
warming and again cooling, a white crystalline mass appeared. 
Similar freezing experiments were made on cymene. The gelatinous state appeared 
turbid and on recooling, crystallization took place ; the substance being transformed 
into a white mass which quickly melted on withdrawal from the liquid air. 
/•*+ 
-1-1-1-1-1- 
- , - 
-1- 
-1 1 » -1-1-1-1- 
1 
t -1-r- 
72 
‘ o 
- 
70 
■ X 
•» 
- 
68 
i 
a -A A A x 
A - 
___ -A - A-A - ^ 
A 
A—Mr 
- 
66 
1 
IOO 80 60 
40 
20 
O 20 40 
60 
80 
IOO 
-—»lemperalure (°C) 
FIG. 12 
Phenylhydrazine. 
o 
/N=H, 
-N-H * 
Two curves for the transition from the crystalline to the liquid state and one curve 
for the gelatinous state down to the temperature —90° C., are shown in fig. 12. As 
