22 
Bulletin 91 . 
Check Plat IV —The seed of this lot was sorted with the greatest of care. 
All diseased and injured tubers were rejected. The plants were sprayed five 
times with Bordeaux mixture. This experiment gave a return of 254 sacks 
per acre,—a return of 36 pounds of tubers for every pound of seed planted, 
making a gain of 40 sacks per acre from spraying. No “run out” tubers 
found in this lot at harvest time. 
Plat V —This seed was also carefully selected and treated in a formalin 
solution on April 18th and planted on April 23rd. The plants reached the 
surface of the ground about the same time as check plants, and they were 
sprayed five times with Bordeaux mixture. This plat was located on the 
highest part of the field, consequently some of the plants suffered more or 
less for moisture. This plat gave a return of 193 sacks per acre,—a return 
of 27 pounds of tubers for every pound of seed tubers planted, making a loss 
of 24%. No “run out” tubers were taken from this crop. Spraying increased 
this yield 8 sacks per acre. 
Plat VI —This seed was the last of the culls taken from the preceding 
lots. It was treated in a formalin solution on April 18th and planted on 
April 23rd. The plants came up irregularly, and many of them blighted 
early in spite of the fact that they were carefully sprayed five times. This 
plat gave a yield of 161 sacks per acre,—a return of 23 pounds of tubers for 
every pound of seed planted, a loss of 36%. Many “run out” tubers were 
taken from this crop. Spraying increased their yield 31 sacks per acre. 
Results. —1. In the three experiments where the plants were sprayed 
five times with Bordeaux mixture, gains of 20%, 5% and 25% respectively 
were obtained. 
2. Dipping clean, sleeted seed in formalin gave a loss of 12% in the first 
experiment and 23% in the second. 
3. Cull treated seed compared with good treated seed gave a loss of 
55 sacks per acre in the first experiment and 32 sacks in the second. 
TABLE I., SHOWING RESULTS OF EXPERIMENT NO. I. 
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I. 
Check_ 
152 
4605 
30.29 
212 
II. 
Dipped in Formalin Solution_ __ 
217 
5725 
26.38 
12% 
185 
III. 
Cull Seed Dipped in Formalin Solution_ ... 
64 
1185 
18.5 
39% 
130 
IV. 
Check, Plants Sprayed 5 Times_ 
140 
5070 
36.22 
254 
V. 
Seed Dipped in Formalin Solution, plants spray¬ 
ed 5 times_ _ _ 
217 
5985 
27.58 
21% 
193 
VI. 
Cull Seed Dipped in Formalin Solution, plants 
sprayed 5 times _ __ 
190 
4380 
23.05 
36 % 
161 
Experiment II —The experiments given in this table were made by C. 
H. Bliss on old potato ground in 1902. It represents the results of experi¬ 
ments carefully conducted on an extensive scale, to test the practical value 
of these seed treatments. Great care was exercised to have the soil, water¬ 
ing and cultivation as nearly the same as possible. A short rotation of 
wheat, alfalfa and potatoes has been practiced on this place. The standard 
formalin treatment was used in the first three of these experiments. A weak 
solution of corrosive sublimate in the fourth, and a strong solution of cor¬ 
rosive sublimate in the last. All the treated seed was dipped in sacks. 
Experiments I and III gave a loss of 11 and 10% respectively, while Ex¬ 
periment II gave a gain of only 3%. The w T eak solution of corrosive sub- 
