PREPARED CHALK 153 



the better salt for rheumatism. It is probable that treat- 

 ment with salicylic acid and lithium citrate ■would be more 

 satisfactory. 



SECTION III. 



Alkaline Earth Metals : Calcium, Barium and 



Magnesium. 



Calcium. 



{The Metal Calcium is not Employed in Medicine.) 



Creta PRiEPARATA. Prepared Chalk. Ca C03. 

 (U. S. &.B. P.) 



Synonym. — Drop chalk, E.; craie preparee, Fr.; prapa- 

 rirte kreide, G. 



Derivation. — Made from chalk by levigation, elutriation 

 and dessication. 



Properties. — A white, amorphous powder, often moulded 

 into conical drops; odorless and tasteless; permanent in 

 the air. Almost insoluble in water ; insoluble in alcohol. 



IncompatiUes. — Sulphates and acids. 



Dose.—B.., §i.-ii. (30.-60.); C, giL-iv. (60.-120.); Sh. & 

 Sw., 3ii.-iv. (8.-15.); D.,gr.s.- 31. (-6-4.). 



PREPARATIONS. 



Pulvis Cretce Compositus. Compound Chalk Powder. (U. S. P.) 

 Chalk, 30; acacia, 20; sugar, 50. 

 Dose.— D., gr.x.- 3 i. (.6-4.). 



Mistura Cretce. Chalk Mixture. (U. S. P.) 



Compound chalk powder, 300; cinnamon water, 400; water to make 



1000. 



Dose.— D., ii.-ii. (30.-60.). 



Pulvis Cretce Aromaticus. (B. P.) 

 Dose.— D., gr. x.- 3 i. (.6-4.). • 



Pulvis Cretce Aromaticus Cnm Opio. (B. P.) 

 (Contains 2i4 per cent, opium.) 

 Do.se.— D..er.x.-xl. (.6-2.6). 



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