—at0 be 
been made on 12 volunteer patches and on 7 regular planted fields. * * * 
Eggs were found on June 7 and the peak of egg deposition was reached on 
June 22. The first eggs laid hatched on June 18. In one badly infested 
experimental plot a maximum of 116 eggs were found on one pod." 
yaitis; ~Oreg.) reports that "During the month (June) a few pods were 
tagged each morning and the eggs on these pods were rubbed off. Then 
the eggs laid during that day were marked the next morning by making a 
circle around them with India ink. They were examined later to determine 
when the black heads of the larvae appeared and when they hatched. In 
May about 25 pods were tagged in this manner and in June more than 200. 
The time required for the eggs to hatch varies greatly with the weather. 
Eggs laid on May 14 hatched in from 22 to 24 days; eggs laid on June 6 
hatched in 8 days; many of the eggs laid on June 24 hatched in 7 days. 
Most of the eggs laid during the month required about 9 days to hatch. 
When, as often happens, two eggs are laid at a time, one on top of the 
other, the lower egg invariably develops first. * * * In May we found 
that eggs were developed only after the females came out of hibernation 
and began to feed in the spring. In the cages it was at least 9 days 
before they began to lay eggs after they were given pea blossoms as 
food. This agrees with our field notes." 
TOXICOLOGY AND PHYSIOLOGY OF INSECTS 
Paris green toxic to mosquito larvae below water surface.—"A 
Statement is made in the literature," Says M. C. Swingle, Takoma Park, 
Md. "that Paris green loses its toxic value for mosquito larvae if it 
becomes wet and no longer floats. This would be a serious charge if 
true, aS such wetting would be sure to follow storms or unusual disturban-— 
ces in the water. A sample of Paris green was therefore tested to de- 
termine this fact. A set-up was used that confined all the green to the 
bottom of the test tube and made it impossible for any solid arsenical 
to be present on the surface. All of the larvae were killed in a short 
time, thus proving that Paris green is toxic when wet and lying on the 
bottom of a pond." 
BEE CULTURE 
Wintering bees in the white clover regjon.--Geo. E. Marvin's study 
of the data obtained in the White Clover Region (parts of Minnesota, 
Michigan, Iowa, and Ohio) on the cost of honey production reveals some 
unusually good information. It was found, for instance, that 3aee per 
cent of the collaborators reported cellar wintering and out of 2,174 col-— 
onies wintered in the cellar 7.2 per cent died. Of the total number of 
the beekeepers reporting, 24.3 per cent wintered their bees out of doors 
in cases, with a loss of 4.5 per cent out of 2,362 colonies; and 42.4 per 
cent of the beekeepers wintered out of doors by wrapping the colonies 
in tar paper, with a loss out of 2,282 colonies of 3.5 per cent. Costs 
