UNITED STATES DEPARTMENT OF AGRICULTURE 
BUREAU OF BIOLOGICAL SURVEY 
WASHINGTON, D. C. 
ADDRESS REPLY TO 
CHIEF. BUREAU OF BIOLOGICAL SURVEY. 
AND REFER TO 
June 6, 1918 
Dr. Alex Wetmore^ 
EL Vado, ITev; Mexico. 
I 
My dear Wetmore: 
'£he Cornell man to whom v/e sent the bird parasites was in 
the office the other day and has made considerable progress in 
identifying these specimens. He is greatly interested in them and 
will work upon them.more tlian can. be said for any one else we have 
asked to assist us on this problem. I think it v/ould be well to 
encourage him by collecting additional material if you have the 
opportxmity. I know you are not as well equipped to do the work 
this sunnier as you were when in Utah, but possibly you may have an 
* 
opportunity to get something. 
He suggests that better methods of preserving the specimens 
are desirable and the formulas he recommends are the following: 
and for all sorts of roundworms a solution of: 
70^ alcohol containing of glycerin, to be used hot 
if possible. 
He states that the best way of collecting specimens is to wash the 
contents of the alimentary troot into white lined tray and decant 
fc. 
all material possible, after which the parasi^ may be easily picked 
up from tho bottom. 
10 parts 
10 parts 
1 part. 
