390 ; Screntifie Intelligence. 
while the water obtained from the steam is perfectly potable. M. 
Hétet gives evidence that his method has been thoroughly tried 
with entire success.— Ann. de Chim. et de Phys. (5), xiii, 29. 
J. P.O, TR 
9. Boracie Acid.—M, Avrrep Drrre (Ann. de Chim. et Phys., 
(5), xiii, 67) has made some new determinations of the “heat of 
solution” of boric hydrate, and also of the “heat of hydration” 
of boric oxide, which have led to remarkable results, It appears 
€ 
units of heat, and that one equivalent (35 grams) of boric oxide 
(fused boracic acid) in combining with water absorbs 6254°7 
the heat was dissipated, the temperature of the mass would 
raised t itte finds that for the specific gravity of 
O1 
mined the corresponding values for boric hydrate. 
At 0° 6=1°5463 Between 12° and 60° &=0°00154 
12 12° and 80° &=0°00148 
Further, it appears that the mean density of the boric oxide 
and ice, which may be regarded as united in the hydrate, is 
siti while that of boric hydrate at 0° is 1:5463, ‘There must, 
