Albrcok AF Base, C. Z. 
20 April 1950 
Dr. Alexander Wetmore 
Secretary 
Smiths or: ian Ins titut e 
Washington, D. C. 
Dear Dr. Wetmore, 
Inclosed are two photographs of the water tank on Barro 
Colorado in case you forgot to Snap one. 
As before, I certainly enjoyed the trip to the island and 
our visit with you. Since I will not be able to go school next 
year I have requested a six month extension mn Canal Zone. We 
are looking forward to seeing you again next year. Did the 
* 
gusaro emerge and was it a new species? Regards to Perry. 
