A Stem Beight of Field and Garden Peas 
II 
water from an atomizer, and placed under bell jars in subdued 
north light in the laboratory. The bell jars were removed after 
48 hours, but spraying was continued for three days more. On 
September 27 , the plants were taken out-of-doors and left in bright 
sunshine. The inoculated areas on all plants appeared watery and 
olive-green in color, as compared with the check four days after 
infection. By the end of six days, there was little change, except 
for a suggestion of a watery zone beyond the edge of the scarified 
areas; the Wellington peas remained unchanged. 
When observed on October 5 , the watery zone had spread 
about 4 mm. beyond the scarifications, in all except the Wellington, 
and tissue removed from this part of the stem swarmed with bac¬ 
teria when examined under the microscope. 
By October 7 , all varieties, except the Wellington, had devel¬ 
oped the disease without question. It had now spread to the 
stipules, giving them a watery appearance, and in some cases, had 
produced a yellowing along the veins just as under field conditions. 
One leaf, that had been inoculated by a needle prick, had developed 
a large yellow blotch, such as occur in the field. The yellow, olive- 
green color and watery character had spread along the stemi some 
distance from the original scar. We had had two hard frosts on 
the 5 th and 7 th of October, and the plants had been exposed to both. 
October 12 , ipi 6 .—After two more heavy frosts, all of the 
plants were taken up, and a careful examination made. One 
of the most interesting points brought out in the experiment 
was the apparent lowering of frost resistance. Without excep¬ 
tion, all of the plants in which the disease had made any 
progress succumbed to the frost and wilted, while every check and 
all of the Wellington plants stood up bright and fresh and showed 
no effects of the cold whatever. It would appear from this that 
the Wellington variety is more nearly immune than any of 
the others. 
Observations October 12 , IQ 15 
Warshauer plants .—Check still green. Three plants were in¬ 
oculated, and all show typical olive-green to brown discoloration. 
This is not confined to the inoculated areas, but has spread over the 
whole stem; vines somewhat shrivelled and tissue swarming with 
bacteyia. 
Horsford plants .—Check in good condition, still green and lit¬ 
tle affected by frost. Four plants were inoculated; before frost, the 
watery, olive-green color had spread over the stems irrespective of 
the original infection; after frost, the vines are shrivelled and 
brown, and bacteria are very abundant in the tissue. 
Alaska plants .—Check normal. Three plants were inoculated; 
one has developed the disease in an unbroken lesion 12 centimeters 
