November 7, 1950 
Mr. Ratibor Hartmann 
Gorgas Memorial Laboratory 
Apartado 1252 
Panama, R. de Panama 
Dear Ratibor: 
Your letter of September 28 was very welcome and 
I am pleased to know that the photographs have reached you 
safely. 
Dr. Clark has been here and I had one very good 
visit with him. Dr. Trapido had lunch with me the other day also 
so that I feel that I am quite up-to-date on matters relating to work 
in Panama. Mr. John Graf, Assistant Secretary of the Smithsonian, 
returned Friday from the Canal Zone and I have been pleased to 
learn about Barro Colorado Island. 
The phonograph records of the jungle sounds made on 
Barro Colorado Island have not been manufactured commercially 
and probably will not be since there would not be sufficient demand 
for them. However, I saw Dr. Paul Kellogg who helped make the 
recordings a short time ago, and he informs me that they have a 
few copies one of which could be made available. The price, however 
is high since they made only a dozen impressions which makes the 
unit cost more than ordinary. If you are interest in trying to 
get them to write to Dr. Paul Kellogg, c/o of Laboratory of 
Ornithology, Fernow Hall, Cornell University, Ithaca, New York. 
Dr. Frank Hartman wrote me some time ago that he 
expects to come down again this year to continue his work with 
adrenal glands. It will be interesting to see further data on this 
subject. 
Mr. Perrygo and I expect to come down also, probably 
in February though I am not certain now as to the date of arrival. 
This year I wi sh co go over on the Caribbean coast between Colon 
and Bocas de Toro. This should be a good place to make some 
collections. Dr. Gazin will be coming down also to look for 
more fossils out on the Azuero Peninsula. 
