244 
efficacy of tlie fungicides, and the results fully warrant the extended 
use of Bordeaux mixture upon such stocks. As early as June 24 
the difference between treated and untreated sections was visible, 75 
per cent of the foliage of the untreated being diseased, while the sec¬ 
tions sprayed with Bordeaux mixture remained healthy. Plates xxi 
and xxn show fairly well the contrast as it appeared on October 11, 
the two rows standing only 3£ feet apart. The difference consisted not 
only in the presence of foliage on the treated and its absence on the un¬ 
treated, but in an increased growth of the former, as is shown by weights 
and measurements of the stocks given below. A calipering of these 
stocks in 1891 showed no appreciable average difference in diameter. 
Diagram 1. —Showing arrangement of treated and untreated rows . 
A D 
B 
E 
0 
- \ 
F 
Explanation of diagram 1. 
A and B, treated 7 times in 1891 and 6 times in 1892 with Bordeaux; C, control on 
row opposite; D and E, treated three times in 1891 and 5 times in 1892 with Bor¬ 
deaux; F, control on row opposite. This portion of the experiment was situated on 
rows VI, VII, and VIII, as indicated in Table 2, below, apd in the plan on p. 257. 
The unbudded portion alone is considered. 
Table 2 .—Showing weights and measurements of treated and untreated French pear stocks 
in November. 
Row. 
Section. 
Diagram 
designa¬ 
tion. 
Treatment. 
No. of 
seed¬ 
lings. 
Average 
weight as 
dug. 
Average 
weight of 
top. 
Average 
diameter 
at collar, 
in thirty- 
seconds of 
an inch. 
Ounces. 
Ounces. 
VIII 
Bb 2 
A 
Bordeaux, 7 times in 1891, 
6 times in 1892.. 
57 
7.6 
6.4 
22.0 
VII 
Cb 2 
B 
.do. 
61 
8.8 
6.8 
27.5 
VI 
1) G 
C 
Untreated in 1891 and 1892. 
57 
5.9 
4.0 
17.6 
VIII 
Bb 1 
D 
Bordeaux, 3 times in 1891, 
5 times in 1892. 
63 
9.1 
7.1 
23.1 
VII 
Cb 1 
E 
.do. 
63 
7.8 
5.7 
22.0 
VI 
Db 
E 
Untreated in 1891 and 1892. 
57 
5.9 
4. 0 
17.6 
The above data were secured in the following manner: The first week 
in November each individual stock was dug carefully and the dirt 
cleaned from the roots. It was then calipered and weighed. The top 
was then cut off and weighed separately. These data are, perhaps, 
the first published showing the superiority of treated pear seedlings in 
other respects than that of foliage. As regards a comparison of the 
two copper compounds, it will be sufficient to say that the Bordeaux 
was in all respects superior to the ammoniacal solution. In the order 
of their efficacy the four methods of treatment are as follows: Bordeaux, 
