316 
would arise. The deficiency of water in the upper portion of the 
stem would cause the lenticels to shrivel and become incon- 
spicuous, whilst the excess of water below the diseased region 
would cause them to become tumescent. 
The rapid killing of a large woody tree by the cutting off of 
food supplies owing to an invasion of the main stem some con- 
siderable distance above the soil surface is a sufficiently unusual 
mode of behaviour for Botrytis to make a further examination 
appear of some interest. 
Period of Attack.—One of the striking features in this case 
is the extreme rapidity with which the upper portion of the tree 
was killed; and this is made more noteworthy when account is 
taken of the fact that the wood of Aesculus Pavia consists largely 
floral structures ‘‘ produces rotting and death within half an 
hour” is totally without action on tissues of a hard woody nature. 
Again woody plants can, as a rule, withstand the cutting through 
of the greater part of their sap-wood by either artificial or 
mechanical means, or canker inducing and other fungi, 
Without serious detriment to the immediate condition of their 
? 
of a tree is only rarely due to fungal attack, and most usually 
* Brooks, F. T., and Bartlett, A. W.: Two Diseases of Gooseberry Bushes, 
Ann. Mycol, vol. viii, No. 2, 1910. 
me W.: “The Action of Botrytis cinerea,” Ann. Bot., vol. xx1%, 
