January 10, 1950. 
Mr. Ratibor Hartmann, 
Gorgas Memorial Laboratory, 
Apartado 1252, 
Panama, R. de P. 
Dear Ratibor: 
I suppose that Dr. Clark has spoken to you about the 
plan that I discussed with him when he was here in November 
relative to field work that I have in mind this coming season. 
I have just received word from Dr. Clark that he and 
Col. Hertig are willing to release you to assist me and I hope 
that this will be fully agreeable to you. 
I am prepared to pay you the same salary that you re¬ 
ceive at the Gorgas Laboratory and will in addition cover all 
of your field expenses while we are on the trip. According 
to present schedule Mr. Perrygo and I will reach Balboa on 
Monday, February 6. We will have a week on other work, in¬ 
cluding a visit to Barro Colorado Island, and probably a trip 
to Ocu where I expect to have Dr. Gazin and Dr. White making 
excavations for vertebrate fossils. I would like to have you 
available to join us as of Monday,February 13. Our work in the 
field would continue until about Tuesday, April 4 when we would 
return to Balboa. 
In the last two months I have been in touch with the 
Commanding Officer of the Inter-American Geodetic Survey and 
from him have learned that we can get into the Serrama de Maje 
by way of Chiman. I had expected last year, from information 
then available, that it would be necessary to go up the Bayano 
River but find now that it can be done more readily the other way. 
I will arrange for a boat to take us to Chiman with the outfit and 
leave us there to return at the end of the expedition and bring us 
back to Balboa. I expect to get some place in Chiman to serve as 
a base where we can unpack and do a certain amount of collecting 
