ON ALCOHOLIC TINCTURES. 
115 
24. Contrayerva. 
grs. 
1 pt. 15 gr. by 60 gr. or 4 pts. ale. at 80° total ext. 1-15 
" 75 " 5 " id. " 1-31 
« 75 " 5 " 56 " 2-29 
« 90 " 6 " id. " 2-22 
" 75 " 5 " 45 " 1-57 
No analysis having as yet shown the nature of the active 
principle of this substance, I choose that degree of strength 
which furnishes the greatest portion of soluble matter, and 
consequently I select alcohol at 56°, and the proportion of 
five parts, which is that which dissolves most of the substance. 
25. Milk Wort. 
grs. 
1 pt. 15 gr. by 60 gr. or 4 pts. ale. at 80° total ext. 4-SS 
" 75 " 5 " id. " 5-06 
« 75 s f 5 " 56 " 6-27 
" 90 " 6 " id. " 6-36 
• £ 75 " 5 " 45 " 6-09 
Water, as we know, readily dissolves the active princi- 
ple of polygala, polygalic acid, I should, therefore, give 
the preference to alcohol at 56°, which furnishes the great- 
est quantity of extract, and is certainly preferable to alcohol 
at 80° for the extraction of this principle, because the pectic 
acid, gum, and albumen contained in this root, are certain- 
ly coagulated by this last vehicle, and thus prevented com- 
ing in contact with the active matter ; and as we may also 
reject the trifling excess of matter dissolved by six parts of 
alcohol, I choose the proportion of five parts of this solvent. 
26. Pellitory of Spain. 
grs. 
1 pt. 15 gr. by 60 gr. or 4 pts. ale. at 80° total ext. 1-24 
" 75 " 5 Ci id. " 1-82 
££ 90 " 6 " id. " 1-64 
C£ 75 " 5 <• 90 ££ 1-20 
££ 60 " 4 " 56 '* 2-13 
££ 75 cc 5 <£ id. ££ 2-20 
££ 75 " 5 " 45 ££ 2-1S 
