20 BULLETIN NO. 3; DIVISION OF ENTOMOLOGY 
EXPERIMENT NO. 5D. 
September 22.—Twelve larve of Plusia brassice and four of Pionea 
yimosalis were placed in one of the tin boxes and sprinkled in the usual 
manner with Cutlers’ No. 5, the powder which had given the best re- 
sult in the last experiment. 
In 5 minutes the Pionea larve were affected, and in 10 minutes the 
small Plusias; the full-grown Plusias not until 25 minutes. The effects 
upon all were very marked. The rectum was everted, and large quanti- 
ties of a greenish liquid were ejected from the mouths of the Plusias. 
At 35 minutes two of the largest Plusias still appeared normal. The 
skin of the Plusias being so delicate the heart beat was watched without 
much difficulty. In the normal individuals the pulse was found to 
range, after numerous trials, from 44 per minute to 68, averaging about 
56. 
The pulse of one of the large worms in its first spasms marked 164, 
and 8 minutes later it had fallen to 150, and in 15 minutes later still to 
140. 
In asmaller one, which had passed through the first convulsions and 
had become feeble, the pulse was almost imperceptible from weakness, 
and though still very fast (186 per minute) had evidently fallen. 
At the expiration of 18 hours the Pioneas were all dead, and 4 of the 
smaller Plusias were also dead. Two of the Plnusias had spun up and 
the remaining 6 appeared perfectly healthy and normal. The pulse of 
these last varied from 44 to 64. 
September 24.—Three more of the larvae spun up, and the first two 
transformed to healthy pupze. 
‘September 25.—The three larvee which spun up on the 24th have trans 
formed to healthy pup. 
September 27.—The remaining larva which recovered from the dosing 
is still strong and active. 
September 28.—This larva has also spun up and transformed to a 
healthy pupa. 
EXPERIMENT NO. 6.—EXPERIMENT WITH CUTLERY’ “SPECIAL INSECT 
POWDER FOR ROACHES AND WATERBUGS.” 
The base of this powder is Dalmatian pyrethrum, but from the odor 
it apparently contains some red pepper. 
September 22.—A full-grown larva of Hyphantria textor was placed in 
a closed glass jar and thickly dusted with this powder, which stuck to 
the hairs in masses. It was seized with no convulsions, and September 
27, after 120 hours, is still alive, though much shrunken and feeble from 
starvation. The powder apparently had no effect upon it. 
September 22.—Four full-grown cockroaches were placed under an in- 
verted tumbler, and a small quantity of this powder puffed in from an 
insufflator. In 15 minutes all were taken with spasms, and in an hour 
wee 
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