162 
out on the Government Plantation, Kampala. The trees were 
arranged in groups containing twenty each, with an average 
girth of 15 in. to 20 in., whilst the system of tapping was the 
half herring-bone, paring and pricking being employed. 
Each separate group was tapped a certain number of times, 
varying from Io to go, and the yield obtained from the trees 
was in practically direct proportion to the number of tappings. 
However, in order to obtain 2} oz. of dry rubber per tree, no 
less than go tappings had to be made. 
The trees are in a thriving condition and bark renewal takes 
place fairly rapidly, so that no ill-effects of the tapping are 
evident. 
At this low yield there is nothing left for European planters 
after paying for the necessary labour, but for native cultivators, 
with the product at a normal price, the returns are just 
profitable. 
The area under Manihot Glazgioviit is not increasing. 
Trials have been made with the allied Manihots (M. 
dichotoma, M. piauhyensis, and M. heptaphylla), but these are 
less satisfactory as regards growth, and the trees are so brittle 
that they suffer severely from every wind storm. 
No tapping has been done on the allied Manihots, but I see 
no reason to hope for any better returns than have been 
obtained from the Manihot Glasiovii. 
[ Discussion. ] 
The CuatrmMan: Has any member any questions to ask or 
any remarks to make on either of the two Ceara papers which 
have just been read? 
Mr. P. J. Burcess: I should like a little more information 
as to ‘how coagulation is done with hot water. 
Mr. AnsteapD: The latex is simply poured into the tin, mixed 
with warm water, and allowed to stand ten or twelve hours 
at the ordinary temperature, which in our districts is about 
72° F. ‘We use water at about 90° C. to 95° C. to begin with, 
and it rapidly cools down. The latex coagulates perfectly 
simply by itself, as long as you keep it in the dail: 
Mr. J. S. J. McCat (Director of Agriculture, Nyasaland): 
I have listened with much interest to the two papers we 
have just heard, one from Southern India and one from 
Uganda. I am very much inclined to agree with Mr. 
Simpson as regards the profit to be made out of the Ceara 
rubber tree in Africa. In Nyasaland we have something like 
14,000 acres under Ceara rubber, which has been planted every 
