Brooks . — Observations on the Biology of Botrytis cinerea. 487 
causes at work in the living cell which confer immunity or predisposition on 
the species of host-plant, or which confer virulence or impotence on the 
spore, they lie deeper than nutrition.’ 
In conclusion, I would like to tender my hearty thanks for the help 
I have received in this work from the late Professor Marshall Ward and 
from Mr. F. F. Blackman and Mr. R. H. Rififen. 
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