61 
Distinction between vanillin and coumarin: an aqueous solution 
of vanillin is turned blue by a few drops of ferric chloride solution 
(U. S. P. test), coumarin is not. An aqueous solution of coumarin, 
unlike vanillin, forms a precipitate, when iodine in potassium iodide 
is added in excess, at first brown and flocculent, and afterwards, on 
shaking, forming a dark-green curdy clot. 
A case has recently been reported in which vanillin was adulterated 
(to the extent of 50 per cent) with terpin hydrate; the adulteration 
was readily detected b}^ the lack of a definite melting point. 
YINUM COCiE. 
■ > Wine of Coca. 
An official wine prepared from the Fluidextract of Coca; it may 
well replace some of the commercial articles of this name. 
Dose. — “Average dose: 16 Cc. (d fluidrachms).” (U. S. P.) 
This is practical^ the same preparation as the Vinum Erythroxyli, 
N. F. 
ZINCI PHENOLSULPHONAS. 
Zinc Phenolsulplionate. 
Zn(C 6 H 4 (0H)S0 3 ) 2 +8H 2 0 
Commonly known as zinc sulphocarbolate; official in British Pharma- 
copoeia as Zinci Sulphocarbolas. It should contain not less than 99.5 
per cent of pure zinc paraphenolsulphonate. (C 6 H 4 (0H)S0 3 ) 2 Zn 1 : d+ 
8H 2 0. 
Character. — Colorless, transparent, rhombic prisms, or tabular crys- 
tals, odorless, and having an astringent, metallic taste; effloresces on 
exposure and may become pink. 
Solubility. — Easity soluble in water or alcohol. The aqueous solu- 
tion is acid to litmus. 
Dose. — “Average dose: 0.125 Gin. — 125 milligrammes (2 grains).” 
(U. S. P.) 
Caution. — Keep in small, well-stoppered bottles. 
ZINCI ST EAR AS. 
Zinc Stearate. 
Used in preparing Unguentum Zinci Stearatis. 
