when water alone is used,and that the paris green is deflocculated or 
broken down by the molasses. Since this is the case, the addition of 
molasses in a poisoned beit for cutworms might be an advantage, as par- 
ticles of paris green would be smaller and a better distribution over 
the particles of bran could be obtained if the molasses am paris 
-g¢reen were mixed together este ag t the bran.=~WWe He We 
‘Ground wheet Weerdorm Hs apples @ as wireworm part, 2eineonae ae to 
F,. He “Shirck, of the Parma, Idaho, sublaboratory, "There is a common 
report that apples make superlatively good bait for wireworms and in 
some of the wrk done recently a comparison was made between apples 
and bait made from graham-flour dough. by planting the two alternately 
in a garden infested with wireworms, The species of wireworm in- 
volved was Pheletes canus Lec. At the end of 6 days, when the baits 
were taken up, 20 “apples contained a total of 131 wireworms, or 605) 
per bait, while 20 graham-flour baits interplanted in the same row 
with the apples contained 267 wireworms, or 14.4 per bait, Many wire- 
worms were found in the soil immediately surrounding some of the apple 
baits, sug esting that they had fed for 2 time and weré leaving. Howe . 
ever, the worms founc in close proximity to the apple bait were counted 
together with thee actually in t'e apples. Baits of ground wheat pos= 
sess an advantage in that they remain in a state palatable to wireworms 
longer than do apples." 

Why some pase uae fail to kill wireworms.-+(C. Ee Woodworth, of the 
Walla Walla, Wash., laboratory, believes that,an answer has been obtained — 
to the above questione A pair of chitinous plates in the mouth of the 
Wwireworm normally keeps the mopth closed unless it is opened by muscular 
tensione There are. three pairs of activé "feelers" (antennae and maxil- 
lary and labial palpi) that apparently recognize arsenic as an undesirable 
substances As the result of a long series of feeding experiments, fol- 
lowed by arsenical determination tests, only one wireworm contained as 
much as 0.001 m g of arsenic in the digestive tracte These observations 
and-experiments incicate that some arsenicals fail to kill wireworms bee 
cause they do not take substances containing arsenic into the digestive 
tracte In wireworms the entire digestive tract, which must be tested, 
often weighs only about 1m Be Consequently, were the ordinary Gutzeit 
apparatus used, the traces of arsenic in the sample would be lost before 
reaching the test papere The apparatus used in the wireworm studies was 
- therefore very much reduced in scalee A one half-dram vial was used as 
a generatore A tube 4 inches long and 12 millimeters in diameter was 
used as a scrubber end a 4emillimeter tube was used to hold the test papere 
With this small-scale apparatus, quantities as low as 0.00lmeg of are 
senic. can readily be detected, Another requirement for these studies 
was a cage in which the wireworms would feel at home and at the same time 
be away from soil and where they could be easily observed. As a result 
of experimentation, a satisfactory cage was developed, consisting of two 
miscroscope slides held 1/16 inch apart by means of wooden strips 4 inches 
by 5/16 inch by 1/4 inch, with two parallel grooves 1/8 inch deep. ‘The 
space between the cover glasses was filled with cellu-cotton pads, dampen~ 
ed so that the atmosphere with 100 percent humidity was maintained. The 
