ON ALCOHOLIC TINCTURES. 
109 
dissolved by alcohol at 56°, and alcohol at 45°, being 0S1, 
is sufficient in amount not to be neglected, and that the 
preference ought to be given to the latter solvent. 
The excess of extract furnished by six parts of the solvent 
is so trifling that it may be neglected, and the proportion of 
five parts can be adopted. 
13. Henbane. 
grs. 
1 pt. 15 gr. by 60 gr. or 4 pts. ale. at 80° total ext. 1-53 
" 60 " 4 " 56 " 3-09 
« 75 " 5 " id. " 3-24 
" SO " 6 " id. " 3 29 
« 75 " 5 " 48 " 4-37 
" 90 " 6 " id. " 4-24 
The Codex has adopted, for the same reason as in the 
two preceding cases, alcohol at 56° in the preparation of 
this tincture ; here, also, the excess of matter dissolved by 
alcohol at 45° is too great to be neglected, since it amounts 
to ros. I, therefore, should employ for these three sub- 
stances alcohol at 45°, and the proportion of 5 parts of the 
solvent. 
14. Hemlock. 
grs. 
1 pt. 15 gr. by 60 gr. or 4 pts. ale. at 80° total ext 2-95 
" 60 " 4 " 56 " 4-20 
" 75 " 5 " id. " 4-19 
" 90 « 6 " id. " 4-23 
u 75 u 5 a 45 a 4 . Q2 
" 90 " 6 " id. « 4-86 
The Codex, on account of the great solubility in water 
of the salts of conicine, has adopted alcohol at 56° for this 
tincture. We perceive in fact a great difference between 
the quantity of soluble matter taken up by alcohol at 80°, 
and alcohol at 56° ; we also see that there is a difference 
of 0-69 between the quantity dissolved by the latter, and 
alcohol at 45°. This excess of soluble matter is perhaps at- 
10* 
