METHOD  OF  PERCOLATION  FOR  FLUID  EXTRACTS. 
21 
in  all  cases  where  the  active  principles  of  drugs  exist  with 
extractive  matter,  glycerin  will  supercede  all  other  men- 
struua.  The  only  doubt  existing  with  me  in  regard  to  such 
an  assertion  is  the  want  of  knowledge  as  to  the  capability  of 
glycerin  to  withstand  or  arrest  fermentation  in  the  presence  of 
vegetable  matter,  and  hope  to  be  able,  at  some  future  time,  to 
give  the  result  of  such  a  series  of  experiments. 
The  following  list  comprises  all  the  substances  I  have  experi- 
mented with,  and  the  menstruum  used : 
Class  No.  1, 
Or  Alcoholic  Fluid  Extracts  ; 
menstruum  composed  of  Al- 
cohol, three-fourths ;  Gly- 
cerin, one-fourth. 
Aconite  Root. 
Buchu  Leaves. 
Calamus. 
Capsicum. 
Cardamom. 
Cascarilla. 
Ceylon  Cinnamon. 
Cubebs. 
Juniper  Berries. 
Lupulin. 
Nutmegs. 
Savin. 
Sassafras  Bark. 
Valerian. 
Ginger. 
Class  No.  2, 
Or  Hydro-Alcoholic  Fluid  Ex- 
tracts ;  menstruum  composed 
of  Alcohol,  one-half ;  Water, 
one-fourth  ;  Glycerin,  one- 
fourth. 
Absinthium. 
Aconite  Leaves. 
Camomile  Flowers. 
Belladonna  Leaves. 
Catnip. 
Catechu. 
Chimaphila. 
Chirayta. 
Cimicifuga. 
Cinchona  Calisaya. 
Collinsonia. 
Colombo. 
Colchicum  Root. 
Colchicum  Seed. 
Conium  Leaves. 
Cypripedium. 
Digitalis  Leaves. 
Dulcamara. 
Ergot. 
Erigeron  Canadensis. 
Eupatorium. 
Galls. 
Gelsemium. 
Gentian  Root. 
Geranium. 
Helleboris  Niger. 
Humulus. 
Hydrastis  Canadensis 
Hyoscyamus  Leaves. 
Ipecacuanha  Root. 
Iris  Florentina. 
