412 Scientific Intelligence. 
than 30°. The author finds that this crystallization and evolution of 
heat is most beautifully observed when large quantities are fused in a 
flask and heated to over 217° then allowed to cool down rapidly for 
ular-crystalline throughout when they are heated fi time 1 
glass tube plunged into boiling water. The external form is but slighly 
changed. 
The insoluble selenium has a much darker color than the soluble 
form even when rubbed to a not very fine powder. When amorphous 
solved and then deposited in small crystals. From these facts the 
author concludes that the granular-crystalline selenium and that crys- 
tallized from a solution of selenid of sodium are identical and essentially 
different from that crystallized from bisulphid of carbon. Glassy sele- 
nium though amorphous belongs to the modification crystallized from 
the bisulphid. : 
The author has also obtained measurable crystals of iodine which, 
as Wollaston and Marchand found, belongs to the right rhombic (tri- 
metric) system. predominant form is the rhombic octahedron, 
the axes, a, 6, &c. being in the ratio 1: 2-055: 1:505. The author’s 
small and brilliant crystals. Schrétter’s red phosphorus presented no 
trace of crystalline structure.—Journal fir prakt. Chemte, \xvi, oa 
pp has 
