ON THE TINCTURES OF CATECHU, KINO, AND KRAMERIA. 24 
Colour, etc. 
Diluted with Seven Volumes of 
Water. 
Tinct. Catechu 
I. 
II. 
I. 
11. 
Opaque, dark 
Opaque, dark 
Dark garnet- 
Dark garnet- 
reddish-brown 
reddish-brown 
red, opaque 
red, opaque 
by reflected 
On evaporation, 
Leaves a trans- 
by reflected 
leaves an 
parent, smoke- 
light. 
light. 
opaque, dull 
brick-red de- 
brown deposit 
Froth persis- 
Froth persis- 
. 
after evapora- 
tent, tinged 
tent, nearly 
white. Co¬ 
pious dark 
chocolate pre¬ 
cipitate after 
24 hours ; 
fluid garnet- 
posit. 
tion. 
with red. No 
precipitate on 
standing for 
24 hours. 
Tinct. Kino . 
Very dark gar- 
Opaque, red- 
Bright garnet- 
red. 
Abundant floe- 
net-red. 
dish-brown. 
red by trans- 
culent preci- 
When evapo- 
Leaves a trans- 
mitted and re- 
citate, which, 
Tinct. Kramerias 
rated, leaves 
a transparent 
purplish-red 
film. 
parent pur¬ 
plish-red de¬ 
posit on eva¬ 
poration/ 
fleeted light. 
on subsiding, 
leaves the 
fluid garnet- 
red. 
Very dark gar- 
Nearly opaque, ! 
Froth rapidly 
Froth persis- 
net-red. 
reddish-brown; 
disappears. 
tent, reddish- 
Evaporated, it 
leaves an 
opaque brick- 
On evaporation, 
leaves an 
opaque brick- 
No change af¬ 
ter 24 hours. 
brown. 
• 
red deposit. 
red deposit. 
# Pale bright 
garnet-red by 
transmitted 
and reflected 
light. 
Froth persis¬ 
tent, tinged 
with red. No 
change after 
24 hours. 
Pale bright 
garnet-red by 
transmitted 
and reflected 
light. 
Froth persis¬ 
tent, tinged 
with red. No 
change after 
24 hours.f 
The contrast, also, in the behaviour of tincture of kino, specimens I. and 
II., when mixed with water, deserves notice ; and I am not as yet prepared 
to say to what this difference may be due, possibly to distinct kinds of kino 
having been employed. Wood states that the tincture of kino is not dis¬ 
turbed by water (U. S. Dispens. p. 496, 12th ed.). 
The construction of such tables as the above involves greater difficulties 
than are apparent at first sight, and which will be best understood by those 
who have made similar attempts. Though the experiments have been fre¬ 
quently and carefully performed, I scarcely expect that all who repeat them will 
arrive at precisely the same results. The differences in quality of the same 
article and the indifferent employment of distinct varieties of some drugs in 
their preparations are serious obstacles to the attainment of definite and exact 
conclusions. 
Moreover, differences in colour, and to some extent in properties, may be 
* An old specimen in the Museum, T. C. D., was rendered opaque and of a rich chocolate- 
brown on dilution with seven parts of water. 
t Sometimes it becomes dull red by reflected light. 
1(5 
