306 
Journal of Agricultural Research 
Vol. XXXT, No. 4 
STEAM GARDEN 
Destroyed 
360 
H3% 
CHK 
F2% 22% 
5 40 
F 1% *3% 
S 30 
7 % 
S85 
70 % 
CHK 
FI'A.% 
540 
17% 
S70 
3% 
5115 
20% 
SIOO 
Flfc 3% 
5HO 
Fl% ™ 
S25 
p2 23% 
525 
f% 7% 
S 40 
5 85 
Fl% 3°^ 
S 25 
FI 20% 
5 25 
F 2 
S 40 
S 85 
F1 ,3% 
SMO 
F3 4% 
S 25 
F 1%. 9% 
5 40 
HjfCI,. ‘W* 
5051-201,000 
Had, 29 % 
sir 1-2.000 
HgCI, 3I% 
525 1-1,000 
mci* 
525 1-4.000 
H*CI, 80 ?‘ 
S25 H.333 
HdCU ‘ f0%, 
SIS l-SOO 
58 5 
FI 1 /*. 
SHO 
FM4 7% 
525 
H*CI*«* 
525 1-400 
10 % 
CHK 
p | 55% 
52 5 
FI‘A. 
S 40 
FI 'h. 2 -' f% 
S 25 
FI 23% 
525 
FI 
S 40 
TreTO 
14*0Jb I40)b 
S 12 525 
S75 
F = 
S = 
FORMALDEHYDE 
STEAM 
16 % 
CHK 
TOP FIGURE ■ PERCENTAGE OF WART 
Fig. 2.— Diagram of the plots treated with the steam pan in 1920, showing relative size and arrangement of 
plots. The length of steaming periods is shown in minutes (e. g., S 60=steam allowed to flow into> pan 
for 60 minutes). The steam pressure was 90 to 95 pounds, except for the two plots where 140 pounds 
pressure is indicated. The steam pan was removed 30 minutes after steam w;as shut off.. VfhvcQ A 
Dint of formaldehyde solution per square foot was applied previous to steaming its strength is ^indicated 
fe g F lV6or F 1H %=1J4 per cent of commercial formaldehyde). Mercuric chloride solutions were 
used at the strengths indicated. The applications were at the rate of 80 c. c. per square foot except that 
the 1 to 400 solution was applied at the rate of 160 c. c. per square foot. The upper numeral (when Present) 
Ls the percentage of the hills of potatoes showing wart in 1921. (Building operations caused the destruc¬ 
tion of one plot before any results were secured) 
