Chemistry and Physics. 131 
"represented by the formulas POs .2NaO. HO and POs . 3NaO easily de- 
compose sal-ammoniac on boiling. The same is the case though in a 
of the alkaline earths are easily decomposed 
by boiling with sal-ammo- 
niac is a fact with which chemists are familiar. Th i 
exposed to the heat of a porcelain furnace and has become crystalline 
in structure, it is quite readily dissolved after having been pulverized. 
Commercial magnesia alba and the carbonate, MgOCO2+3HO, are 
Didymium, and Lanthanum, contained in Cerite. The 
= 
‘pr a 
_ Solved, and the same is true for Galmei, carbonate and bo 
ing com : 
ry slowly and only after 
Yds of manga and iron are in like t iss 
xyds of manganese, zinc, and are in like manner easily dis- 
