298 PREPARATION OP THE VALERIANATE OF ZINC. 
Macerate for 12 hours in a tinned copper basin, agitating 
now and then with a wooden spatula: at the end of this 
time expose the mixture for some minutes to a temperature 
of 158° to 168°, strain through linen with slight pressure, 
treat the residue with a fresh quantity of distilled water 
and express, and subject it to a third and even to a fourth 
digestion, each time in 2 parts of distilled water. There 
remains a tenacious pitchy magma, which is exposed to a 
gentle heat in half a part of essential oil of turpentine and 
as much distilled water : the latter to dissolve the gummy 
portion, the former to dissolve the resin; strain with pres- 
sure. If the residue is not entirely exhausted, place it again 
over the fire with a fresh quantity of essential oil and water; 
mix all the liquids, and evaporate in the water-bath until 
all moisture is driven off, stirring constantly. 
Chem. Gaz.from Journ. de Pharm. 
ART. LXII ON THE PREPARATION OF THE VALERIAN- 
ATE OF ZINC, AND ITS MEDICINAL EMPLOYMENT. 
The valerianate of zinc, first proposed by Prince Louis 
Lucien Bonaparte as a medicine of considerable value, has 
for some years occupied an important place in the thera- 
peutics of the Italian physicians. Dr. F. Devay, physician 
to the Hotel Dieu of Lyons, has recently made numerous 
experiments with this substance, the remarkable results of 
which have excited the attention of French practitioners to 
a high degree; and the valerianate of zinc has all at once 
got into great favor, so much so that for some weeks this 
salt is constantly being prepared by the principal pharma- 
ceutists of Paris. 
