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MONTHLY LETT ER OF THE BUREAU OF ENTOMOLOGY. 
Tike 
= Le ey | Jane, 1916. 

DO COMMON FOOD PLANTS CONTAIN INSECTICIDAL CONSTITUENTS? 





















x 
Dr, N. McTndoo is now using potato-bestle larvae, aphids, fall webworms, and 
‘larvae in determining whether or not certain common plants contain insecti- 
constituents. ‘This work is carried on cooperatively between the Bureaus of 
ogy and Plant Industry. Mr. A. F. Sievers, chemical biologist of the Bureau 
t+ Industry, prepares the extracts and powders from the plants suspected of con- 
; toxic principles and Dr. McIndoo applies these substances in the various ways 
hich known insecticides are used. Some of the field men are rendering great aid 
lecting and sending in plants which are supposed to contain poisonous substances. 
This cooperation is fully appreciated-and it is hoped that the field men of other 
ions will collect any supposed poisonous plants, in the regions in which they may 
) located, and transmit them to Dr. A. L. Quaintance, at the Bureau of Entomology, 
th any incidental information which may be of value concerning them. 
TULANE UNIVERSITY HONORS WALTER DAVID HUNTER. 
On June 7, 1916, Tulane University conferred the degree of Doctor of Laws upon 
dD. ‘Hunter, in Charge of Southern Field Crop Insect Investigations, of the Bureau 
| Be ckoicsy. 
Dr. W. D. Hunter , in Charge of Lee Field Crop Insect Investigations, is in 
ceipt of the following letter from Dr. Howard, 
> Dr. Pescn: : 
“4 * * T have been vis iting a number of field stations, Be eye with the one at 
1 ack Va., before I left Washington on my long trip, and here and there, as in 
‘ious field trips to field laboratories, I find a considerable diversity in breed- 
a iocs and other instruments and methods, which, although depending for their di- 
ae to a certain extent upon the different kinds of insects being handled, are 
30 different in accordance with the comparative ingenuity of the individual workers. © 
Ny naturally, very few men have the opportunity to visit other field stations, or, 
all events, field stations of sections of the Bureau other than their own, It re- 
48, therefore, that it is desirable that knowledge of these different ideas should 
c 01 8 general throughout the Bureau, and I think that it should be urged upon all 
1d workers that when they have found some new rearing device, or some modification 
an old ons, which upon sufficient test proves to have decided advantages, it should 
photographed and clearly described and sent in to headquarters in Washington. 
mM if it can be described sufficiently in the Monthly Letter without illustrations, 
S can be done for the benefit of all workers in the field. If illustrations are 
: a circular can be prepared, which can be presented, not only to our field 
$ in the Bureau, but to others, (Signed) L. 0. Howard, Pasadena, Cal., June 
L916, 


