Dll. C. I!. PLOWRIGHT ON BRITISH DYE PLANTS. 
393 
IIumulus lupulus. — Gave a very fair yellow with alum; the 
young tips were used. 
Salix tkiandra. — The dried leaves are said to give a yellow ; 
in this 1 was not very successful, but with copperas they gave 
a yellowish-black. 
Salix cinerea. — The leaves gave a pale yellow-brown, reddened 
by potash. 
Qukrcus robur. — The bark gave a pale red-brown with alum ; 
with copperas a purple-black. 
Carpin 6 s betulus. — The young bark gathered in autumn, and 
also in spring, gave only a pale brown — not a distinct yellow, as 
one would expect from the older writers. 
Bktula alba. — Six patterns are shown. The leaves give a good 
yellow, with alum ; the bark, pale brown — a reddish brown ; and, 
with potash, a distinct rufous. The bark contains betulin, 
C„HA, (A. G. P.). 
Alnus GLLTIN08A. — A dozen patterns are shown. One yellow, 
from the catkins, with alum ; the others, from the bark, brown, 
dark brown, red-brown, reddish, greenish-grey, — purple, grey, 
chocolate, and black-brown, by the action of potash and iron. 
Although not strictly within the limits of this set of experiments, 
a very good black was obtained from the bark with bichromate 
of potash, but this was a salt not available by the ancients. The 
bark contains alder tannin, C^lI^On- 
Myrica gale. — T he whole plant, with alum, gave a dirty yellow, 
or pale yellowish brown. 
Juglans regia. — Although the walnut is not a native British 
plant, yet it has been grown in this country for a long time. 
The green husks have been used by dyers until quite recently. 
They require no mordant, and impart a rich permanent brown to 
wool. A pale shade, with a suggestion of pink, is given to the 
later “dip.” It contains nucitannic acid. 
Iris pseudacorus. — The rhizome, when boiled with wool for 
a prolonged period, imparts to it a brown colour. 
Phragmites communis.— The fresh young flower-heads give, 
with iron, a peculiar green. 
Sticta pulmonaria. — Gives a rich chestnut brown. 
