MONTHLY LETTER OF THE BUREAU OF ba Pe tlle VED 
UNITED STATES DEPARTMENT OF AGRICULTURE * OT 102% 

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Number 232 Activities for July August 1933 
(Not for publication) 


NOVEL IDEA REGARDING PRESERVATION OF FIELD NOTEBOOKS 
Wm. P. Yetter, Jr., in charge of the field laboratory at Cornelia, 
Ga.,. has called attention to a method he has developed for preventing 
notebooks used in the field from getting dirty and wet with perspiration, 
as frequently happens in field work in warm weather. Both covers of the 
field notebook are covered with a layer of cellophane, which has been 
found to last the lifetime of the book. The top sheet of the book will 
then always be clean and will not blur. On the inside of the covers, 
information likely to be needed can be written in for ready reference, 
or the covers may be used as a place to carry loose papers, as diagrams, 
etc. Small maps too large to be inserted in the cover of the book may 
be Similarly covere° with cellophane. 
TOXICOLOGY AND PHYSIOLOGY OF INSECTS 
Diphenylene oxide promising insecticide for bean beetle and po- 
tato beetle.--M. C. Swingle, Takoma Park, Md., reports that "A supply of 
larvae of the Mexican bean beetle and the Colorado potato beetle were 
collected from the field in the past month (July) for rearing and test- 
ing insecticides. In all, about 800 larvae were used in dusting tests 
and a good supply was kept for rearing. * * * Diphenylene oxide, nic-— 
otine 'bentonite,' and rotenone were tested on the bean beetle. Only 
the first compound was effective and it seemed very promising. Diphe- 
nylene oxide, nicotine 'bentonite,' manganese arsenate, and a 1 percent 
mixture of diphenylene oxide in kaolin were tested on the potato beetle. 
The manganese arsenate and the undiluted diphenylene oxide were both 
very effective." 
BEE CULTURE 
Cardboard sections unsatisfactory for storing honey.--E. L. 
sechrist, Davis, Calif., reports: "Earlier in the season this office was 
the recipient of 50 cardboard sections sent for experimental purposes. The 
paper sections were very unsatisfactory, both in putting them up and in 
the final result. They were badly gnawed by the bees, the tops of the 
sections becoming fuzzy and unsightly. In folding the sections they tend 
to be out of square, the dovetails do not hold well, and the corner must 
be pasted together. It is difficult to put foundation into these diamond- 
shaped sections and after it is put in place the sections spring back 
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