61 
^"Distinction between vanillin and coumarin: an aqueous solution 
of vanillin is turned blue by a few drops of ferric chloride solution 
(D. 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 curd}" 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 by the lack of a definite melting point. 
yixrii coc.E. 
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 fiuidrachms).'- (U. S. P.) 
This is practicallv the same preparation as the Yinum Ervthroxyli, 
N. F. 
ZIXCI PHENOLSULPHOXAS. 
Zinc Piienolsulphonate. 
Zn(CeH,( 0 H)S 03 ) 2 - 8 H 20 
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^( 0 H)S 03 ) 2 Zn 1 : 1+ 
8H2O. 
Character. — Colorless, transparent, rhombic prisms, or tabular crys- 
tals, odorless, and having an astringent, metallic taste; effloresces on 
exposure and may become pink. 
Solubility. — Easily soluble in water or alcohol. The aqueous solu- 
tion is acid to litmus. 
Dose. — “Average dose: 0.125 Gm.— 125 milligrammes (2 grains).” 
(U. S. P.) 
Caution. — Keep in small, well-stoppered bottles. 
ZINCI STEARAS. 
Ziuc Stearate. 
Used in preparing Unguentum Zinci Stearatis. 
