418 
JOURNAL OF ECONOMIC ENTOMOLOGY. 
[Vol. 16 
practices from the entomological viewpoint will be available. Indeed, 
with only a short period of study—some twenty-five years—no more 
positive results can be expected if they are to be considered as authori¬ 
tative. 
There is no doubt but what similar studies to those made by Dr. F. C. 
Craighead, a former specialist on forest entomology under Dr. Hopkins, 
and his successor as Forest Entomologist, on the locust borer could be 
done with other forest insects, even though it is not yet entirely proven 
to the satisfaction of foresters and entomologists that this method is 
entirely effective in the case of the locust borer. Much more work should 
be done with the locust borer to thoroughly prove that shading the trunks 
will prevent attack by sunlight-loving beetles. 
Notable host plant studies were made by Craighead, and J. M. 
Miller has made valuable contributions to our knowledge of forest-tree- 
seed destroying insects. 
Along other lines studies have been made by Dr. Hopkins and mem¬ 
bers of his staff on the periodicity of attack by barkbeetles, endemic and 
epidemic conditions, distances of flight, slash disposal, solar heat control, 
etc., and much valuable data accumulated. 
Methods for the control of insects injurious to both crude and finished 
forest products have been determined. Special treatments, such as 
chemical wood preservatives, sprays, and determination of effective 
kiln drying temperatures, etc., have been developed by Dr. T. E. Snyder 
and are in effective use, even to the extent of enabling American manu¬ 
facturers to compete with foreigners for trade in the Tropics with 
chemically treated, ‘ ‘white-ant-proof ’ ’ furniture, etc. Snyder discovered 
that Lyctus powder post beetles lay their eggs in the pores of wood. By 
closing these pores by the use of any ordinary filler, attack by these 
insects can be prevented. 
The most important and economical methods, however, are those first 
recommended by Dr. Hopkins, i. e. of management. With a knowledge 
of the biology of the insects, it has been possible to slightly change the 
methods of handling timber so as to create unfavorable conditions for 
attack by insects. By simple methods of classification of stock in 
piling, periodical inspection, and utilization of the older stock first, 
injury to seasoned hardwood lumber and products by Lyctus powder post 
beetles can be and is being prevented, resulting in the saving of enormous 
stores of hardwood for the Army and Navy. 
Certain termites require moisture—shut off from the ground, their 
source of moisture, by proper construction they will dry up. The 
