( 445 ) 
TABLE 10. 
13. Finally table 11 gives a survey of the ratio of the spec, 
gravities of different allotropic forms of the same element at different 
temperatures: 
TABLE If. 
Temperature 
Ratio ‘? dia, - ond 
^graphite 
Ratio ^ white - in 
4 18°.0 j 
1.585 
1.266 
- 38° 
1.583 
-164° 
1.582 
1.274 
14. We see from table 11 that down to — 164° there are no 
indications that the spec, gravities (resp. the spec, volumes) of the 
different allotropic modifications of the same element converge to 
one and the same value in approaching the absolute zero point. 
It is only owing to the great kindness of Prof. Kamerlingh Onnes, 
w ho placed the resources of his laboratory at our disposal, that it 
has been possible for us to carry out the above investigation. 
We ma y be a n owec j also here to express our great indebtedness to him. 
To Mr. G. J. Flim, technical assistant at the Cryogenic Laboratory 
at Leiden, many thanks are due for his intelligent assistance. 
October 1909. 
