45 
Experiment 11. 
October 10 {11:05). — Six per cent dilution. Number of l;irv;p, 10. 
Date. 
Living. 
October 12 
Total 
m o 
Experiment 17. 
October 24 (12:05 p. m.). — Thirteen per cent dilution. Nnmbci of larva, 0. At 
4 :•">:-; Larvae still active and apparently unaffected. 
October 26. — Have fed freely; 3 webbed. 
October 29. — One feeding; 5 webbed; 3pnpas. 
November 13. — Two pupated imperfectly and died; others have issued. 
COLD-OIL DECOCTION. 
One and one-half ounces pyrethrum added to one-half pint headlight oil placed in 
iled Mason jar and left over nighl at a temperature of 68 F. Filtered the next 
morning and emulsified the filtrate with half as much rain water. This emulsion 
was used in experiment- 13, 11. and 15. 
Exp< rimeni 13. 
1 1 ■,■,.. io | f:05 p. n> . ). — Four per cent solution. 
O ■/ tber I.'. — Three nearly grown larvae lively: 5 dead, all about half grown. This 
bree ling cage, as also the one of experiment 14, was found to have cracks in, which 
had 1)^' !U nunotice 1. au I many of the larva' escaped. 
Expo') mi ni 11. 
October 10 1 12:55). — Seven per cent dilution. Late in the eveniug the larvse ap- 
peared somewhat uneasj . 
October 12. — Two half-grown ones may live; 11 half-grown ones are dead. 
Erperimi ni 15, 
October 24 (tt:25). — Thirteen per cent solution. Number of larvae, 10. At 1:25, 1 
half-grown larva? are unable to crawl ; 2, about a third grown,in the Bame condition : 1 
nearly grown ones can travel about, though their actions are not perfectly normal. 
October 26. — Two trying to web up; 1 larva feeding, and 7 dead. Of the dead, 5 
are half grown, the other 2 yonnger. 
October 29. — A F> »11 Worm in the cage attacked and devoured one of the webbed- 
up larvae : the secon 1 one pupate I, and the third died in the attempt. 
November 17. — Pnpa has prodnced an imago. 
Inexptfrimoiitsl3a.nl 11 the foliage remaiued unimpaired, but in experiment 13 
it w a> Blighl lv SCO! <lied. 
QOT-Oll Dl C< m riON. 
One and one-half ounces pyrethrum added to 1 pint headlight oil, and at 10i43 a. m. 
the jar was placed io a water bath to heal to a temperature a few degrees short of 
iii" point of explosi »n. namely 170 F. \t 11 a. m. a temperature of 1AQ 1 
