August 3, 1950 
Dr. H. G. Lederer, 
Director, Biological Laboratories, 
R. M. Hoiiingahead Corporation, 
Camden 2, New Jersey. 
Dear Dr. Lederer: 
In November 1949, you were kind enough to forward 
to me three cans of your #2 Insecticide, as supplied the United 
States Quartermaster, due acknowledgment for which was made 
in my letter to you of November 28, 1949. 
The Insecticide was used in a hand operated Air-O-Spra 
during a field expedition in a remote area in eastern Panama. 
The field work was concerned with the collection of birds for 
scientific specimens. We lived in part in open houses and in 
part in open temporary shelter made in the jungle. Our specimens 
were kept in special containers and were put out regularly on 
racks in order that they might dry. 
Our main concern which regards the specimens is the 
destructive action of ants which occasion much trouble. The 
use of the Insecticide on the supports for the drying racks and 
around the storage containers was wholly effective and we had 
no trouble whatever. 
In addition to this^ we used the spray against flies and 
mosquitoes in our living quarter^ and in the native houses against 
ants, cockroaches, flies and mosquitoes. In all instances it 
proved entirely effective. I may add that the amount required 
for protection was surprisingly small. 
I have added the Air-O-Spra and this Insecticide to the 
items for permanent field equipment for future expeditions of this 
kind. 
I had no occasion to use the Deodorant furnished at the 
same time so have no report to make on this. 
