ON ALCOHOLIC TINCTURES. 
121 
alcohol was too great, I always obtained less extract than 
when it was just enough ; that is to say, the more I increas- 
ed the quantity of the alcohol, the more the quantity of 
extract was decreased. 
This fact, analagous to that which I have often observed 
when water is added to a concentrated solution of opium 
when we see substances precipitated that were previously 
held in solution ; this fact, I say, sufficiently proves, that 
there is a great inconvenience in too much increasing the 
proportion of alcohol in the preparation of tinctures ; for, 
besides that, the density of the tincture would be diminished 
by this addition of alcohol, it would be still more so, by 
the precipitation of a certain quantity of matter, as occurs 
m the case of the solution of opium. 
Ji Table, of the different strength of Alcohol to be employ- 
ed in the preparation of each substance. 
We prepare, with one part of the substance and 5 parts 
of alcohol at 80°, the tinctures of — 
Yellow bark 1 gr. of tincture, equal to 0*20 in powder, 
Jalap, 1 gr. « 0*19 
Cinnamon, 1 gr. " 0-20 " 
Pellitory of Spain, 1 gr. " 0-20 " 
Saffron, 1 gr. " 0-17 " 
Castoreum, 1 gr. " 0-18 " 
Myrrh, 1 gr. " 0-19 « 
1 part of the substance and 5 parts of alcohol at 56° for 
the following tinctures : — 
Rhubarb, 1 gr. of tincture, equal to 0-18 in powder. 
Wormwood, 1 gr. " 0-19 " 
Gray bark, 1 gr, « 0-20 " 
Ipecacuanha, 1 gr. " 0*19 " 
Nux vomica, 1 gr. " 0-20 " 
Gentian, 1 gr. <• 0-18 " 
Red Bark, 1 gr. " 0-20 " 
Foxglove, 1 gr. " 0«18 " 
11* 
