

- 23 - 
Yl ties of seeds, previously treated with naradichlorobenzene, in order to 
determine whether this fumigant will injure seeds for planting purposes 
after having been fumigated against insect attack. After seven months 
constant fumigation, some varieties of seeds have shown a considerable 
reduction in viability, as compared with checks kept under similar condi- 
ms tions." 
‘wa C. B. Wagner conducted experiments in the combined use of heat 
and hydrocyanic acid gas for the fumigation of a large flour mill in 
Kansas City, Mo., cnJuly 3, 4, 5, and 6 under a cooperative arrangement 
with the milling company. A total space of 1,332,221 feet was under fumi- 
gation and the total time of exposure was 71 hours. Owing to a strong 
wind, killing temperatures were not reached on the third, fourth, and 
fifth floors until midnight of July 5. Mr. Wagner says: "Temperature at 
‘this time seemed to have penetrated accumulations, and piles of insects 
were noted about concrete pillars where they had been hunting cool spots. 
The temperature. finally became lethal and the insects had dropped to the 
floor." It was necessary to fumigate the first floor with hydrocyanic 
acid gas, since there were no heating lines on this floor, and Mr. Wagner 
reports: "A 92 per cent kill of confused flour beetle was obtained in 
the (elevator) boots. The accumulation, however, protected the beetles 
to such an extent that it was impossible for the gas to penetrate in such 
places." 
TOXICOLOGY AND PHYSIOLOGY 
Results of studies on responses of blowflies in a wocden olfac-— 
tometer are reported. by N. E. McIndoo, Takoma Park, Md., as follows: 
"Using Lucilia and Calliphora I have finished the 4 curves for 2 ferment— 
ing sugar solutions containing wild yeast. A curve representing the 
‘average of these rises rapidly and on the fourth day of fermentation, 
reaches its peak (76 per cent), then slowly descends and crosses the 
neutral line between the 17th and 18th days, and on the 25th day the sour 
liguids were 72 per cent repellent. Two curves each were obtained by 
using lactic acid, ammonia water, and milk (fresh and sour)." 
Mr. McIndoo also made a study of the food preferences of potato 
beetles last summer, conducting 48 tests with the larvae and 24 tests each 
with the males and females by feeding them portions of leaves of the pota- 
to plant (Solanum tuberosum), horsenettle (S. carolinense), bitter night- 
shade (S. dulcamara), and tomato (Lycopersicum esculentum). It was shown 
that in general the males and larvae prefer the horsenettle, one of their 
Mavliye food plants, to their adopted one; .while the females prefer their 
adopted food plant, the potato. 
M. C. Swingle, of the Takoma Park laboratory, reports an experi- 
ment made to determine whether newly hatched larvae of the codling moth 
