LEGUMINOS. 467 
ether only a minute percentage of a substance, whose scaly 
_ erystals display under the microscope the character of pyroca- 
: The crystals extracted from kino dissolve freely in cold -water, 
: which is not the case with catechin, and this solution assumes a 
_ fine green if a very dilute solution of ferric chloride is added, 
and turns red on addition of an alkali. This is the behaviour 
of catechin as well as of pyrocatechin ; but the difference in 
 pyrocatechin rather than catechin. 
“We thought pyrocatechin must also occur in the mother- 
cation of its presence being perceptible either in the fresh bark 
or wood iti (1878) extracted from kino colourless prisms of 
loric acid, about 1:03 sp. gr. One 
very little of it remaining in solati 
The latter is extracted by exhaustin 
which by evaporation affords crystals of 
be recrystallized from boiling water ; 
formula C!* H!? 08, which is to be regarde 
ylated gallic ether of pyrocatechin, viZ., 
H® 05. Kinoin by heating it to 180° C. giv 
turns red; 20'# H!? 08 = OH! 0% H” Ou, 
duct is an amorphous mass agreeing with kino-red ; by heating 
it at 160 to 170° it again. loses water, thus affording another 
anhydride. 
kinoin. They should 
es off water and. 
“We have prepared kinoin fro 
affords about I4 per cent. of kinoin. 
turn red on addition of ferric salts. 
"us 1°3 per cent, of ash.” (Pharmacograph: 
Commerce.—Kino is chiefly collected on 
and exported from Cochin direct to Europe. A false rps! 
_ techin, rather than that of catechin, which crystallizes in prisms. — 
E, solubility speaks in favour of the crystals afforded by kino being © 
plant of kino, but this does not prove to be the case, no indi- | 
kinoin by boiling the drug with twice its weight of hydro- | : 
ooling, kino-red'separates, _ 
on together with kinoin. — 
@ the liquid with ether, — os 
The latter pro-— 
Etti succeeded in preparing methylic chloride, 
as well as gallic acid, C7 H°.0%, by 
the Malabar Coast, — 
they agree with the — a 
das that of a me=- 
C* H* (OCH*) C? ie 
m Australian kino, but failed : es 
-,0, which Btti says he used. Kind 
The solutions of kinoin 
Commercial kino yielded 
ja, 2nd Ed., p. 196.) oe 
ae oe 
