19 
the latter, it us a very similar leather. Its employment, 
like that of the true sumach, is confined to the tannage of light 
leathers and to sstsdisiin ing the colour of goods which have been 
tanned with the bark k of Rhus Thunbergii and other darker 
coloured materials. Alone, it produces a somewhat soft but 
light-yellow uices In South Africa, the leaves are exhausted 
with hot water and the liquor alone is used, whilst in the case of 
ihe true sumach both leaves and liquor are die brought in 
contact with the leather. For the supply of the leaves employed 
in this investigation, I am indebted to the kindness of Mr. R. H. 
Coaton, of Wellington, Cape of Good Hope. 
“The lea aves, roughly broken by hand, were extracted in a 
Soxhlet’s apparatus, first with ether to remove wax and chloro- 
phyll, and subsequently wee alcohol, which dissolved both 
colouring matter and tanning principles. The light bro 
alcoholic extract, after being evaporated to a small bulk, was 
poured € water, vet mixture irme rs ether, and the 
small quantity of alcohol verre removed from the aqueous 
liquid by rie poen hi ch on cooling became "idoia owing 
to the separation of crystals ; thien were collected with the aid 
of the pump, and washed eit mag i with ether, chloroform, and 
dilute alcohol until the washings were rait ie The yellow 
produce thus obtained was further puri by two or three 
erystallisations from dilute alcohol, and a itn crystallisation 
from boiling water. The substance was dried at 130° and 
analysed. 
T 4 1136 gave 0- ope CO, and 0:0497 H,O. C = 51°66 = 
0:1103 0:2102 C 0:0526 H;0. C= 5197. HZ 
GO, requires C= 51°76 ; = 479 per cent. 
It was obtained as a glistening mass of pale yellow needles, almost 
insoluble in cold, and only sparingly soluble in boiling water, 
but readily in alcohol. When heated, it sinters at 180°, and at 
185° melts to a thick, treacly liquid. The addition of ferric 
chloride to its aqueous vatem produced a dark green colora- 
ith 
4-86. 
5:99. 
tion, and with lead acetate an orange-yellow precipitate was 
formed.  Dilute alkalis dissolved it, yielding orange-yellow 
liquids. 
* Experiment having shown that this substance was a glucoside, 
its oe ition with acid was studied in the following 
mann 
or 7658 gram, dissolved in 600 c.c. of boiling water, was digested 
with 5 c.c. of sulphuric acid for two hours at this temperature ; a 
yellow, crystalline product had then commenced to separate, and 
more of it was deposited on cooling. This was collected (the 
filtrate being reserved for further examination), washed with 
water, and dried at 160°. In this way, 03710 gram of a yellow 
colouring matter was obtaine ed. 
“(1111 gave 0:2427 CO, and 0:0370 H,0.C = 59:58; H =3: 70. 
. C,,H,,0; requires C = 59:60; H = 3:31 pe r cent. 
* Tt formed a glistening mass of yellow needles ubi soluble 
in water, somewhat readily in alcohol. In alcoholic solution 
ferric chloride caused a dark green soluit and | aceta 
gave an orange-red precipitate. pe. es 
16573 | B2 
