F, J. F. SHAW 49 
(a) Three plants of green C. capsularis were infected at 10 a.m. on 15th July 
in the axils of lateral shoots ; two others were infected ina similar situation 
after making a small tangential cut on the stem surface and one was infected in a 
small cut at the base of the stem. All the wound infections and one of the 
infections upon the uninjured stem took and produced a brown rot at the seat 
of infection within 24 hours. These plants all died from 7-14 days after infection 
(Pl. V, fig. 2). In the remaining two infections on uninjured stems the inoculum 
was lost, probably washed away by rain, in the 24 hours succeeding the 
inoculation. . 
(b) Six plants of red C. capsularis and six plants of red C. olitorius were 
infected on 7th August at 11 a.m. ; three plants of each variety were wounded. 
All wound infections took, with the usual symptoms of “ black band,” but in 
the case of the infections upon uninjured stems the inoculum in each case dried 
up and failed to infect the stem. The three wounded plants of red eapsularis 
and one plant of red olitorius died 12 days after inoculation. In the remaining 
two wound infections on red oliorius the infection produced a black stain 
running up and down the stem, but did not succeed in ringing and killing the 
plant. 
(c) Three plants of red C. capsularis and three plants of red C. olitorius were 
infected on the uninjured stem surface on 13th August at 10 a.m. The stem, at 
the seat of infection, was lightly covered with a small piece of cloth tied above 
and below the inoculum. Two of the infections upon red eapsularis and one upon 
red olitorius succeeded in producing the typical discoloration on the stem but the 
plants were not ringed and did not succumb to the disease. 
In this experiment, therefore, infections in the field were much less successful 
upon red C. capsularis and red C. olitorius than upon green C. capsularis. Under 
the conditions prevailing at the time of the inoculations the two red-stemmed 
varieties seemed less susceptible than the green-stemmed. 
Experiment XVI. All the infections in this experiment were carried out on 
uninjured stems of green C. capsularis in the field ; each infection was covered 
with a small strip of thin white cloth. Controls with sterile agar were set up 
in each case. 
(a) On 23rd August at 11 a.m. 22 plants were infected. In only five cases 
were there any signs of the infection taking and only one plant died. 
(b) On 28th August at 6 p.m. 12 plants were infected. All these infections 
took and 8 plants died. The first plant wilted on 4th September and 8 plants were 
dead by 26th September, when the experiment was closed. 
(c) On 14th September at 11 a.m. 12 plants were infected. Nine plants were 
killed by the fungus, during the next three or four weeks, 
