23 
Mav 4 this experiment was repeated with a fresher lot of 
eetles with more marked results, curculios commencing to die 
wo days after treatment in all the poisoned lots but one, all 
f one lot being dead in nine days, and in ten days all of every 
oisoned lot but a single beetle. In the check lot, meanwhile, 
nly one had died. 
Paris green experiment Xo. 2, May 4, 1889. 
Check lot. 
1 lb. to 100 gals. 
1 lb. to 200 gals. 
1 lb. to 300 gals. 
1 lb. to 500 gals. 
Died. 
Number used, 
12. 
Number used, 
12. 
Number used, 
12. 
Number used, 
22. 
Number used, 
22. 
3 
2 
1 
7 
1 
4 
2 
8 
1 
2 
2 
1 
q . 
2 
3 
3 
6 
10. 
1 1 
i 
3 
1 
1 
4 
G 
4 
4 
IS 
4 
2 
5 
14. 
i 
1 
1 
Total. 
1 
12 
12 
22 
21 
In both the above experiments, as also in the following, peach 
eaves were used as food, and these were sprayed but once. 
All strengths of the poison mixture here killed the beetles 
eedino* on° it, the difference being seen in the rapidity with 
vhicfAhey took effect. In four days from poisoning the ratios 
ailed were 42 per cent, in lot two, 33 per cent , in lot tliiee, 2 < 
3 er cent, in lot four, and 18 per cent, in lot five. 
Finally, May 17, a still more extensive experiment was begun 
with London purple, three hundred and forty-seven curculios 
being divided into five lots as before, their treatment differing 
fronT that of the foregoing only in the substitution of London 
purple for Paris green. The results were rendered, however, 
somewhat less satisfactory by the lateness of the season, \\ hich 
probably accounts for the number of deaths in the check. 
Other parallel observations led to the conclusion that spent 
adults, doubtless the earliest to emerge, were already beginning 
to die spontaneously. The experiment was continued for eight 
days, when all the curculios of the first lot were dead, and 
nearly all of the other poisoned lots, a fourth of the check ha\ - 
ing also perished. 
