44 
Foliage in experiments 5 and 6 uninjured. 
The second emulsion was prepared as the first experiment, except that the propor- 
tions were 3 ounces of pyrethrum to 11 pints rain water. This is the emulsion nsed 
in experiments 7, 8, and 9. 
Experiment 7. 
October 10 (12 m.). — Four per cent dilution. Number of larvae, 16. 
Date. 
Living. 
Dead. 
October 12 
Total 
4 half grown. 
2 Aery young. 
10 
6 
Experiment S. 
October 10 (11:49 a. m.). — Six and one-half per cent dilution. Number of larvse, 19. 
Experiment 9. 
October 24 (11 :55 a. m.) — Thirteen per cent dilution. Number of larvae, 10. At 4 :37 
p. m. 1 larva had webbed, but was badly affected. The other 9 were active and 
feeding. 
October 26. — One pupa, 8 active and feeding; 1 dead, half grown. 
October 27. — One more webbed. 
October 29. — One more pupa, 4 webbed, and 3 feeding. 
November 20. — All but one pupa which was imperfectly formed, have produced 
imagos. The imperfect pupa is dead. The foliage in experiments 7, 8, and 9 was 
uninjured. 
HOT-WATER DECOCTION. 
Three ounces of pyrethrum were added to \\ pints rain water, placed in a sealed 
Mason jar, and boiled for one hour. Filtered and emulsified a portion of the filtrate 
with headlight oil. This is the emulsion used in experiments 10, 11, and 12. 
Experiment 10. 
October 10 (It : 25). — Four per cent dilution. Number of larvae, 19. 
Date. 
Living. 
Dead. 
October 12 
Total 
2 half grown 
2 very young 
15 
4 
