‘€ + 
Chemistry and Physics. = 267 
erystallized compound is somewhat greater than that of aa that of 
the fused substance somewhat less; on heating, dense vaporsjrre iven 
is: 
Very small proportion of alcohol however suffices for its complete pre- 
Fp tation.—Monats-bericht der Akademie der Wissenschaften zu Ber- 
in, July, 1850. 7. . 
12. Constitution of Tourmaline.--RAMMELSBERG has communicated 
‘ h ¢ 
the protoxyds and the quantities in the sesquioxyds and t 
Sunes, Vol. XI, No. 82.— March, 1851. ae 
ae 
