1921] 
MATSUMOTO—SPECIALIZATION IN RHIZOCTONIA 45 
small or somewhat deformed, but probably not caused by the 
fungus, since those in the check were similar in type. 
Experiment 7. (Inoculation of egg-plants with the six strains). 
—Sterilized pots with a few egg-plants (1.5 inches high) were 
inoculated below the surface of the soil, as in many previous 
cases, with the 6 strains. After 2 weeks the results observed 
were as follows. 
TABLE XXXI 
INOCULATION OF EGG-PLANTS 
Fungus PIUT FA P7 B1 H B3 | Control 
No. plants inoculated........ 20 18 16 18 15 10 5 
No. plants damping off...... 18 10 | None 9 10 |None| None 
Per cent diseased............ 90 56 0 50 67 0 0 
TABLE XXXII 
INOCULATION WITH ORIGINAL CULTURE MATERIAL OF P1 
Plants inoculated No. plants used | No. plants infected 
Potato (10 days after sprouting).......... 10 5 (stem lesion) 
Lettuce (about 2 inches)................. 20 13 
Egg-plant (about 2 inches)............... 20 12 
Navy beans (about 2 inches).............. 15 7 
Lima beans (about 2 inches).............. 13 6 
In general, there were notable differences in the pathogenicity 
of the different strains, and this was rather consistent for each 
strain. In every case the virulence of the strains of P1 and H 
was remarkable as compared with that of the remainder. 
Nevertheless, I have still some doubt whether the tendencies 
manifested by the different strains are sufficiently distinctive 
to be considered as the fixed hereditary characteristics of those 
strains. Studies in that direction might throw some further 
light on the differentiation of the strains. 
In order to throw further light on specialization in respect 
to pathogenicity as a factor which might or might not be readily 
