20 
cinchona. The cinchona produces a large number of small 
seeds, and consequently there is no difficulty in obtaining ample 
seed from a few trees, sufficient for planting up large areas. 
, The bark gives a good yield of alkaloids when the tree is four 
years old and, songs the annie ae SS ae comes 
rom any Lagibilicee tree*. There is also the Sesto of cross- 
fertilisation, as, n if the seeds be taken from good milkers, 
they may have tok ~polliinited from trees which are poor milkers. 
The points which require elucidation are :— 
1. To ascertain if trees can be classified as good and poor 
milkers 
2. To ascertain which trees are el pees! 
3. To collect seeds from particu 
4. To avoid ‘eross-fertilisation nerve good and poor 
milkers 
5. Assuming that both male and female elements be 
derived from good milkers, there would probably be poor 
milkers among the ancestry. This would produce throw- 
backs, which might necessitate selection over another 
generation. 
The necessary procedure would appear to be either : — 
a) To plant up a small area surrounded by jungle so as to 
isolate i trees in the area from those of the plantation, or :— 
select a small area on an estate which is separate from 
other vita of the estate, and proceed to keep a pecan RS the daily 
yields of the dry rubber from the trees of this As it 
becomes apparent that certain of these trees are pea? “‘milkers, 
they should be cut out until eventually the trees on this area 
consist of good milkers only. 
, as under (a), the trees have to be planted up on a fresh area, 
it will be seven or eight years before the poor milkers can be 
ee If, however, an area already planted up should be 
ound sufficiently isolated from the main part of the plantation 
S prevent the possibility of cross-fertilisation, a couple of years 
would probably es to ascertain which are the poor milkers 
and to cut them 
The seeds now erie in this area will be entirely from good 
milkers. They will gage Eonar the majority of which will be 
good milkers, although a of them, in accordance with (5), 
may be throw-backs, hd scmbaatantty poor milkers. However, 
the seeds from this area should be a vast improvement on seeds 
collected at random on an estate. Having carried the procedure 
so far, it would be well worth while to make a further selection 
by planting up a new area separated by a broad jungle belt from 
other Hevea trees, and again to proceed regularly to record the 
* This difficulty might be overcome by cutting of seed-bearing branches 
just before the seed is : fully ripe, 
