UNITED STATES DEPARTMENT OF AGRICULTURE 
BUREAU OF PLANT INDUSTRY 
WASHINGTON 
FOREIGN SEED AND PLANT INTRODUCTION 
Mar. 1, 1933 
Mr. J. F. Rock, 
c/o British American Tobacco Co., 
Yunnanfu, China. 
Dear Mr. Rock: 
The March number of the Geographic, containing 
your article on the chaulmoogra oil tree, is out, and 
we are sending to you separately at the above address 
and also in care of the American Vice Consul, Bangkok, 
Siam, two copies each. We are afraid to send more 
at this time, on account of our not having a definite 
address from you. 
Enclosed herewith you will find United States 
Public Health Service Report, "Fractionation of 
Chaulmoogra Oil," Reprint No. 646, in which you will 
be interested and which Doctor Fairchild asked us to 
forward to you. 
We are holding here about twenty copies of the 
Geographic and shall await orders from you as to their 
disposal. 
Very sincerely yours 
S 
Acting Agricultural Explorer in Charge. 
