47 
turbid, foniirNl a precipitate, and has a soni or vinegar-like smell. The pyrethrum 
smell i> but faiutly recognizabh . 
Experiment 21 was made for the purpose of determining any difference in the 
effect of the changed or fermented decoction and the fresh nitrate. 
Ezpi riment 21. 
Ortoher 24 ( 12: ?o).— Full strength applied. At 5 p. m. all the larva 1 , 8 in number, 
lively. 
October 96. — All well and active. 2 having webbed. 
October 29. — One feeding vigorously, 4 webbed, and 3 pupa?. Evidently no results. 
and experiment closed. 
SIMPLE HOT-WATEB DECOCTIOIT. 
Three ounces pyrethrum to H pints rain water, boiled for one hour in a sealed 
Mason jar. After boiling, filtered and kept filtrate in sealed Mason jar. This decoc- 
tion was prepared October 8, and used in expei iments 22, 23, and 24. 
Experiment 22. 
October 8 (4:20). — Full strength sprayed npon 49 larvae. The very young began 
tumbling off in a few minutes. By 5 p. m. many of the newly hatched larvae were 
evidently dying. 
Pate. 
Living. 
l>ea<t. 
Oct 10 . . . 
7 half grown. 
'J4 very young. 
Total 

31 
Experiment 23 was a half strength of the same decoction and. as no special results 
were obtained, can be omitted. 
Though this decoction had been boile'd. the filtrate subsequently became turbid 
and formed a whitish precipitate. Practically in the same condition as the decoc- 
tion used in experiment 21. 
Experiment 24. 
October 24 {12:15). — Full strength of the fermented decoction sprayed upon the 
larva. Their behavior in all important respects was the same as of those in experi- 
ment 21. 
Experinu nt 25. 
October 10 (1:40). — A number of worms were simply sprayed with cold water 
as a check upon the effect which a forcible wet spray would have npon the very 
young and half-grown larva). Almost immediately occurred the usual dropping off 
of the very young larvae and the seeking of dry quarters noted in the other eacm ■ i 
merits with the aqueous decoctions. 
October 12. — All but one half-grown one are quite active and feeding. 
Date. 
I.i\ in-. 
Oct. 10 
:; half grown. 
7 \ cr\ youa g 
10 
Total 
8 
