Bulletin 91 . 
26 
of formalin to sixteen gallons of water for two hours. Each pound of seed 
gave a return of 21 pounds of tubers, making a yield of about 128 sacks of 
tubers per acre—a loss of 14%%. 
Results. —1. Divide Prolifiic seed treated with standard formalin solu¬ 
tion gave a loss of 10%. 
2. First year’s Wisconsin Pearl seed treated in standard formalin solu¬ 
tion gave a loss of 10%. 
3. Second year’s. Wisconsin Pearl seed treated in a standard formalin 
solution gave a loss of 14%. 
TABLE V., SHOWING RESULTS OF EXPERIMENT NO. V. 
*4-1 > 
54-1 
GG 
o 
cd 
m g 
O g 
$ 2 
o 5$ 
gS £ 
0 © o 
0 £0h 
m 
£ 
O 
« © 
c/3 C 
a'a'V 
B °os 
c n 
m 
C 
Variety, 
Where Raised 
TREATMENT 
O s_t 
0h © 
n's 
5 © 
O eti 
PhEC| ^ 
© cfl 5 
£ S 
a ©£ 
5-° 
3 0 
55H 
°3 
0) 
rZ.S 
0 
55 
•s&e 
2 > v 
A) ^ O 
«4—1 
u 
O 
rH 
cd 
0 
^ S—< 
g © 
p. 
£4 
B 
Z 
Prolific, Divide ( 
Check. .. _ . _ _ 
60 
1580 
10 
26.33 
158 
Seed 1 
Formalin Treatment . 
60 
1410 
10 
24.00 
1C$ 
Loss 
144 
Pearl, Wiscon- ( 
Check_ _ 
50 
1660 
12 
33.20 
199 
sin Seed -< 
First Year ( 
Formalin Treatment_ 
50 
1490 
12 
29.80 
If* 
Loss 
179 
Pearl, V T iscon- ( 
Check_ _ 
40 
990 
15 
24.75 
149 
sin Seed •< 
Second Year ( 
Formalin Treatment_ 
40 
O 
no 
OO 
15 
21.25 
14H* 
Loss 
128 
Experiment VI —The experiments given in the following table were made 
by the Agricultural Department in 1901. Rose Seedling seed was used which 
had been stored in a damp cellar. Many of the tubers were more or less 
covered with Corticium hyphae. This seed was removed from the cellar 
about June 1st, and placed in a dry room until June 12th, which thoroughly 
dried all the tubers. The field on which this seed was planted Jhas been 
under cultivation for a number of years. It was plowed late in the spring 
and the seed was planted on June 12th. None of the plats were watered, 
still nearly all of the plants remained green until killed by frost. 
Plat I Check —These plants were more or less diseased, but most of 
them looked strong and healthy until killed by frost. The fruiting stage 
of this fungus was observed on many of the plants. One hundred and forty 
pounds of seed gave a return of 767 pounds of tubers, a yield of 5 33-100 
pounds of tubers for every pound of seed planted, or about 32 sacks per acre. 
Plat II —This seed was of the same grade as the check lot. It was 
treated with corrosive sublimate one week before it was planted. These 
plants were a little slow in reaching the surface of the ground, but they 
soon looked fully as strong and vigorous as the checks. Very few scabby 
or diseased tubers were found in this lot. One hundred and one pounds of 
seed produced 539 pounds of tubers, a return of 5 17-50 pounds of tubers for 
every pound of seed planted, making about 32 sacks per acre, no gain over 
check. 
Plat III —This seed was also of the same grade as the check lot, but it 
was treated with formalin a week before it was planted. The plants came 
up fully as well as those of the check plat and apparently were as strong 
and vigorous. One hundred and five pounds of seed gave a return of 466 
pounds of smooth clean tubers, a yield of 4 11-25 pounds of tubers for every 
pound of seed planted, making a loss of 17%. About 27 sacks of tubers to 
the acre. 
Plat IV —This seed was carefully selected, rejecting all tubers contain¬ 
ing sclerotia, but all of the seed tubers were more or less covered with the 
hyphae. Eighty pounds of seed gave a return of 475 pounds of tubers, a 
