POWDERED DRUGS. 
313 
3. INSOLUBLE IN ACETIC ACID. 
* SOLUBLE IN NITRIC ACID. 
If necessary, in deciding on any of the next four, 
they are to be fused with potassium carbonate or sodium 
carbonate, and a regular qualitative chemical separa- 
tion effected. 
205. Calcii Phosphas Praecipitatus. — In glycerin mount 
alone small tetragonal and cubical crystals are ob- 
served. If to a few milligrammes of the powder on a 
slide we add a few drops of nitric acid, and then 
ammonium molybdate solution, stirring well with a 
glass rod, small yellow diamond-shaped crystals are 
observed, which are permanent in glycerin mounts. 
206. Calcii Sulphas. — In glycerin mount alone needle- 
shaped crystals, or long crystals in masses which look 
like a group of sclerenchyma fibers, are observed; flame 
test with platinum wire = bright reddish yellow. 
207. Barium Sulphate. — In glycerin mount alone 
irregular-shaped crystals varying from small to large 
are observed; flame test = green. 
208. Terra Alba. — This is aluminum silicate and 
magnesia (3 : 5) and occurs in irregular masses. 
