394 
Book II. 
Division II. 
SALTS. 
monia in rhomboidal prisms, which give a green colour 
to syrup of violets. 
With an excess of acid, it yields 
needle-formed crystals of super-arseniat of ammonia, 
which deliquesce when exposed to the air. 
When arseniat of ammonia is gently heated, it loses 
its transparency and part of its alkali. In a strong heat, 
a portion of the ammonia is decomposed, water is formed, 
arsenic sublimed, and azotic gas disengaged. This was 
one of the experiments which first led Scheele to the 
discovery of the component parts of ammonia*. 
Sp. 9. Arseniat of Glucina. 
Unknown. 
Sp. 10. Arseniat of Tttria: 
WHEN yttria is dissolved in arsenic acid, and the so 
lution boiled, arseniat of yttria precipitates in the state 
of a white powdert. 
Sp. 11. Arseniat of Alumina. 
ARSENIC ACID readily dissolves newly precipitated 
alumina. When the solution is evaporated, it gives a 
thick mass insoluble in water. This salt may be form 
ed by mixing the alkaline arseniats with sulphat, nitrat, 
muriat, or acetite of alumina f. 
Sp. 12. Arseniat of Zirconia, 
Unknown. 
* Scheele, i. 145. 
Eckeberg, Crell's Annals, 1799, ii. 70. 
1 Scheele, i. 160.