THOMAS: INFECTION OF APIUM GRAVEOLENS is 
Ten plants received each 100 c.c. of this solution. Two other 
sets of ten plants were treated respectively with nitrates and 
phosphates equivalent to the amounts fed to the first set in the 
complete nutrient solution. Five plants received 5 gm. each of 
hydrated lime on the surface of the soil and the soil of five others 
was top dressed with sheep manure. All of these plants were 
inoculated together with controls immediately after the addition 
of the fertilizers. The infection counts from them are shown in 
TABLE IV. All of the plants seemed vigorous in their gross 
appearance except those treated with lime. In this case the 
roots in the upper inch or so of the soil were discolored and some 
appeared to be killed outright. The leaves appeared somewhat 
less turgid and vigorous than those of the other series. 
The small margin of difference between the controls and 
treated plants, especially in the case of the phosphate, makes the 
results appear doubtful. It must be borne in- mind, however, 
that the concentration of the solutions was that recommended 
for water cultures and did not result in marked increase of growth 
in the treated series. When it is considered that each plant in 
the nitrates series receives only 0.166 gm. of the salt, it will be 
seen that striking results cannot be expected except with the lime 
and manure whch were applied in considerable quantity. _How- 
ever, the results are in accord with those of the other experiments 
reported here. Whether or not the increase in new growth under 
field conditions would enable fertilized plants to increase the total 
yield in spite of increased infection is of course not shown by 
these experiments. 
In watching the plants from day to day it seemed that not 
only was: there an increase in the number of spots on plants 
treated with fertilizer but there was also a tendency toward the 
formation of larger spots and more rapid breaking down of the 
tissue between the spots. In the field, where conditions were 
more favorable for the growth of the host than could be supplied 
in pots in the greenhouse, a count of our nineteen hundred spots 
was obtained from a single leaf (Easy Blanching) and, as will be 
pointed out later, the older leaves regularly withered entirely 
from the coalescing of the spots. It is true that the field conditions 
of the season in question were also more favorable for the develop- 
