September 30, 1949 
Mr. Ratibor Hartmann, 
c/o Gorgas Memorial Laboratory, 
Apartado 1252, 
Panama, R. de P. 
Dear Ratibor: 
A letter recently received by Dr. Kellogg at the 
National Museum from Dr. Clark tells me that you are "now 
employed as a technician for the Laboratory, news which 
pleases me very much. I know that you will find this work 
interesting and to your lilting, and I wish you all success 
in it. 
I have written you twice since my return and 
one letter contained some pictures from our work at Chepo. 
This was addressed to you at avenida Norte No. 16-A, Panama, 
?uid the other to General Delivery, Panama City. I hope that 
you will get tnese communications and that you will write me. 
Mr. Perrygo and I often speak of you and of the 
.interesting work that we had together. I have a little camp 
up in the Blue Ridge Mountains, SO miles west of Washington* 
and Perrygo has been over with me twice since our return to 
spend the weekend. Vie have done some trapping for mice and 
shrews and have collected a few birds just to keep our hand 
in practice. 
I wrote you in my letters that we have flown over 
the whole Bayano Valley in an airplane before coming north 
last May. I ara planning definitely on a trip into that 
section toward the close of the next dry season, probably at 
the end of February and in March, and want very much to have 
you accompany me as a member of the party. I certainly hope 
that you will be able to arrange this. 
