

217 
objection to it is, that it probably does not destroy either the worms 
or the moth, but only repels the latter, inducing her to deposit her 
eggs on other vines not thus protected. 
Our experiments of the past season have shown one fact that we 
had not previously observed, viz: that where vines are growing in a 
plat, and where the growth covers the ground, the injuries wrought 
by the borer are confined chiefly to the borders of the plat. Owing 
to this fact, our experiment would doubtless have given more mark- 
ed results had the hills been planted in one consecutive row. 
For the experiments, we used a plat of Hubbard squashes, consist- 
ing of eight rows, or 64 hills, planted ten feet apart each way. The 
seeds were planted June 3, and the hills were covered with plant 
protectors, to prevent injury from the striped bug. After the 
plants had made some growth, the protectors were removed, and the 
hills were thinned where they required it, to four plants each. 
On July 22,we placed in each hill of the first and second rows, five 
corn-cobs, dipped their whole length in coal tar. To the plants of 
the seventh and eighth rows we applied Paris green and water, at 
the rate of half a teaspoonful of the poison to two gallons of water, 
pouring the liquid upon the stems throughout their whole length. 
About two weeks later, the cobs were again dipped in the coal tar, 
and the Paris green and water again applied to rows seven and 
eight. Soon after this time, the vines had made so vigorous a 
growth, that we found it necessary to defer making further applica- 
tions of the Paris green and water. 
On October 9th and 10th, we made a very careful examination of 
the vines, scrutinizing each stem and branch separately from its 
base to its terminus. The treatment of the different rows, the num- 
ber of plants in each, and the number of borers found, is here 
given : 
Row 1, which had 31 plants, treated with coal tar,*contained 6 borers 
ce ce ¢ ee ‘ 
2, 30 ¢ > Wie. G, ee S ee 
ALG Y cc 240—Ci‘ ®t treated a Bits 
ee 4, e¢ 28 6 ee ee 19 ee 
ce 3D, a4 30 ee a4 6 16 
6¢ 6, ce 31 6e ee ee 20 
RG IgGs mm 181 ‘¢ treated twice with 
: Paris green and water ‘ LE aii 
ee 8 Ce 32 ee ee ee (a4 ee 25 ee 
Ne 
From the fact that the injury wrought by the borer is confined al- 
most exclusively to those hills that form the boundaries of the plat, 
it is evident that row No. 1 is comparable only with row No. 8. 
Even this comparison is unjust, because No. 8 received two applica- 
tions of Paris green and water, which probably destroyed some of its 
borers, as is indicated by comparing Row 6, not treated, with Row 
7, treated with Paris green and water. Row 2 is comparable only 
with Rows 4, 5 and 6, because Row 3 was probably sufticiently near 
to receive some influence from the coal tar. 

*A bout half of the borers had left the stem when the examination was made. 
In such cases we counted the cavity formed as a borer. 
