Au|pE$ j , 1911. 
Dear Sir: 
I beg leave to enclose herewith an account for expenses 
incurred by Mr. D. F. MacDonald in connection with certain 
geological work in Costa Rica, presumably done for the Geolog- 
4 
ioal Survey, but the account for the expenses of which Mr. 
MacDonald has apparently transmitted to this Institution 
through mistake. 
The only connection the Institution had with this matter 
was its authorization of Prof. Henry Pittier, who is at present 
engaged in botanical investigations for the Institution in the 
Canal Zone, to accompany Mr. .iaoDonald to Costa Rica for the 
purpose of indicating to him the localities where certain col¬ 
lections were made some years since. 
Very respectfully yours, 
F w. true- 
Acting Secretary. 
The Director, 
U. S. Geological Survey, 
Washington, D. C. 
