It Is requested that the 
following number be quoted 
in the reply to this letter, 
and that replies be addressed 
to the office, and not to in¬ 
dividuals by name. 
FOREST RESEARCH INSTITUTE, 
KEPONG, SELANGOR, FED. MALAY STATES. 
.21st.Janua ry ,. 1 9 38. 
Dear Henderson, 
Yours of 18.1.38 re dipterocarps on 
limestone. I know of no other records than those you 
mention - Pentacme malayana and the Langkawi tree 
Hopea ferrea (you collected this in young fruit on 
Pulau Daytog Bunting) . It is probably, as you 
suggest, not so much the presence of lime that accounts 
for their scarcity on limestone, as the absence of 
adequate shade and moisture for germination and early 
development. 
I hope to have a trip to Kedah (and 
Langkawi this year but I doubt if I can manage it 
before mid-June because I am also trying to go to 
B.N.B. However, I shall let you know when I fix it 
up and we may be able to botanize together somewhere. 
Family all very well thanks - hope yours 
is also. 
/ 
Best Wishes, 
M.R. Henderson, Esq*, 
Waterfall Gardens, 
PENANG . 
Yours 
