New York AGricutturaAL Exprrmment STation. 739 
Remedies. Curtis, in “ Farm Insects ;” Boisduval, in Entomo- 
logie Horticole; Duponchel, in “Iconograph of Caterpillars ;” 
Dr. Fitch, New York’s first State Entomologist, and in fact nearly 
all entomological writers since the time of those above named, 
recommend capturing the adult butterflies with a hand-net. 
This, in fact, seems to be the most practical preventive that can 
be used. If market gardeners would give a bounty of, say, 50 
cents per 100 for all cabbage butterflies caught between the 
Ist of March and the 1st of June, the money so invested would 
yield large returns by the end of the year. Each butterfly lays 
at least 100 eggs, probably 300; for the sake of an estimate sup- 
pose 100 eggs which survive to make adult butterflies, allowing 
that one-halfin each brood are males. Then, from one butter- 
fly, in the second brood there would be 2,5v0 ; in the third, 
125,000; and in the fourth brood, 625,000 female butterflies. If 
turnips, radishes, or some other plant of the mustard family that 
flowers early in the season were set on the borders of the 
cabbage field the butterflies could be caught on these and thus 
avoid the liability of injury to the cabbage plants by the boys 
chasing the butterflies over the field. 
Without doubt Paris green and London purple are the most 
reliable remedies to be used; that is, they can be depended upon 
to kill caterpillars that feed upon cabbage. Their use in powder 
form has been generally recommended especially in preference to 
using them in water alone, as it is difficult to make water adhere 
to the leaves of cabbage. But, as shown by experiments made 
on the cabbage moth larva late in the season, the indications are 
that it is best to use the above remedies in the wet form, pre- 
pared as given in formula in article on insecticides on a sub- 
sequent page. As shown inthe following experiments, if applied 
in powder form while the dew is on, as thick as farmers usually 
apply “slug shot,” or if a light shower should follow their appli- 
cation they are liable to injure the foliage. 
The following experiments, though a part of a number of dis- 
connected experiments which were primarily intended to test the 
killing properties in field and in laboratory of a number of the 
arsenites, show reasons for the above estimates: 
September 25. Sprayed a plat of 220 cabbage plants with Paris 
green, also sprayed the same number of plants with London 
