197 
judging from the American experiments, probably be necessary 
to spray at intervals of about a month. 
JXpLaNaTion oF Prats VI. 
Actinonema rosae. Portion e-year old rose shoot 
‘Juliet’ in April, showing the winter infection of the stem. 
XIX.—THE OIL PALM IN THE CAMEROONS. 
region and its plant formation. Under the heading useful wild 
The section dealing with the Oil Palm in the Cameroons (pp. 
115-120), includes some information not previously published in 
a transition from grassland to forest takes place, the palms 
occurring in such quantity on the edge of the slope as to form 
0 
found forming groups in valleys at 
as mentioned above, it may constitute almost pure palm-forest. 
dense zone around a village, 
ate of semi-cultivation. The 
being kept in this case in a state 
Banyang villages are encircled by oil-palms nt 
Besides a high temperature, the special requirement of the tree 
is su . ; 
the rainfall is less than 100 or 150 cm. Th Big are 
tive to drought, when the latter is somewhat prolonged ; bu 
ise it 1 Thus it not only grows in 
which are warm and damp, 
] 
ab 
being subject to much rain, but it also occurs on the grasslands 
