20° 25° 
Fig. 2. 
30°31°32°33°34935° 
At 40°,0 the velocity was so 
great that I could no longer 
measure it. 
In Fig. 2 the measurements 
are represented. The abscissae are 
temperatures, the ordinates ve- 
locities. 
I have also taken up the study 
of antimony which appears to 
undergo similar changes (explosive 
antimony, GORE). Other metals 
too, such as aluminium, invite 
investigation. 
Amsterdam, University Chemical Laboratory. 
November, 1899. 
(December 20, 1899.) 
