"a 
459 
annum in Uganda (Kew Bull. 1907, p. 188), a tree yields from one 
small to two double gin flasks of juice, Gold Coast (Armitage, 
i i ce to 
Director, Kew, Nov. 30, 1898) and 2468 c.c. of latex, přoducing 
ith an 
of the channel alternately, subsequent cuts being 2 in, from 
previous cuts (l.c.). h 
5 c.c. of latex, equal to about 321 grammes of dry rubber, was 
obtained from 9 trees having an average girth of 195 in., tapped 
on the *vertical-parallel'' system. A yield of 4 oz., 2 oz. and 
1 oz. has been obtained respectively from one tree 7 years old, 
25 ft. in height, 19 in. girth at 3 ft. from the ground, one 
9 years old, 26:8 ft. in height, 21 in. girth at 3 ft. from the 
ground, and another same age and size, all tapped in the month 
of December, Gold Coast (Johnson, Col. Rep. Misc. No. 38, 
1905, p. 8). 
Two and a half oz. of rubber in one day have been obtained 
from trees 5l years old tapped on the double-herring-bone plan 
of fifteen cuts each side, in the Cameroons (Tropenpfl. July, 1905, 
386), where it has been found that one man could collect from 
apart (10 ft. by 10 ft. — 435 trees per acre) the yield under these 
conditions being calculated at about 407 Ib. of dry rubber 
per hectare ( — about 164 lb. per acre) per year, at a cost 
for collecting of about 7d. per Ib., the value, at the time, of the 
Lecomte, in Revue des Cult. Col. i. June 1897, pp. 12-19; July 
1897, pp. 41-47. ** Kickzia africana, Bth. im Deutschen West 
pp. 217-221. 
pflanzer, i. 1897, pp. 99-103. 
à Caoutchouc et à Gutta, Jumelle, in Annales L'Inst. Col. Mar- 
seille, v. 1898, fasc. 1, pp. 68-7 — — € Über Westafrikanische 
Kickxia-Arten,’’ Preuss in Notizblatt Bot. Gart. Berlin, No. 19, 
July 1899, pp. 353-360. U 
* Die Überführung der K?ckzia von 
