Botanic Gardens, Singapore 
Straits Settlements 
October 3, 1940 
Dear Dr. Quisumbing, 
' 
Thank you for your letter of September 13th. 
As regards the Derris specimens, we are prepared to 
take the risk of loss in transit. Will you please return 
them as soon as you can. I suggest that they be insured 
for a sum equivalent to 50 cts. per sheet and am willing 
to pay the cost of such insurance. 
We have duly received the two parcels containing 120 
duplicates, as advised in your letter, and thank you for 
this continuation of exchange. 
As regards mean monthly temperatures for Singapore, I 
can only supply the data for 1931-1938; and unfortunately 
there was a change in tie position of the observatory during 
the period, namely at the end of May 1934. The observatory 
was removed from a small hill (under 100 m. high) west of 
the town to a level place near the sea (by the airport) east 
of the town. I think it likely that there is a small mean 
difference between temperatures at these two localities, but 
it would not be more than 1 degree Fahrenheit. The four 
years 1935-1938 will give you a fair average, as the changes 
of mean temperature are always very slight. All local re¬ 
cords are published in degrees Fahrenheit. 
Yours sincerely, 
(S£d.) R. E. HOLTTUM 
Director of Gardens, S. S. 
Dr. E. Qwisumbing 
Bureau of Science 
Manila, Philippines 
A TRUE COPY 3/14/41 ete 
