386 Schweinfurt Green. 
rated in acapsule to dryness. This residuum weighed 
two drams. It was ofa brownish red, intermingled with 
brilliant specks, and had a pungent and styptic taste. _ It 
was soluble in water, and its odour was that of native 
Rhubarb. : 
] presume that this preparation will be useful in medi- 
cine, and will deserve the attention of physicians. Ist, be- 
. cause the different kinds of Rhubarb have qualities so va- 
rious, that in.many cases the ordinary dose is very uncer- 
tain. 2d. because this extract will be of uniform strength 
herever th p is followed. 3d. because it may be 
given very safely in solution even to new born infants te 
evacuate the meconium, one or two grains will be sufli- 
cient for this purpose. 4th, because the remedy is thus de- 
prived of its ligneous and mucous portions, which if not in- 
jurious, are at least useless. 
. Ishall esteem myself happy if the process which J have 
thus pointed out, shall furnish a new resource to the heal- 
ing art; and if those of my brethren who have its progress 
at heart, shall concur with me in introducing this prepara- 
tion into the practice of physic. 
Bib. Univ. July, 1823. 
_ 22. Schweinfurt Green.—Dr. Liebig, in the Annales de 
Chimie of August 1823, states that the preparation of this 
fine colour, as recommended by Braconnot, being tedious 
and expensive, the following is much preferable. ; 
~ Dissolve in a copper kettle by heat, one part of verdi- 
gris in a sufficient quantity of pure vinegar, and add to 
it an aqueous solution of one part of white arsenic; a precip- 
itate of dirty green generally esha, which must be dispelled 
by ae more vinegar untilthe precipitate is perfectly dis- 
solved. 
Boil the mixture, and after a time, a granular precipitate 
will form, of the most beautiful green, which being separa 
ted from the liquid, well washed and dried, is nothing more 
oor less than the colour sought for. If after this, the liquor 
contains copper, more arsenic may be added; and if it con- 
tains an excess of arsenic, more’ copper may be, added, and 
the pro ated. It often happens that the liquid con-. 
tains an excess of acetic acid. It may then be employed 
jor dissolving more verdigris. 
