318 
in the cortical tissues (Pl. vii. Fig. 8, a-c, b-d), a result at 
variance with the experience of previous investigators. — 
s no differential discoloration of the wood in trans- 
verse section as was found by Brooks and Bartlett in gooseberry 
bushes attacked by Botrytis. 
the actual fungal invasion. In the a : 
their content and the cellulose walls become swollen, yellowish 
in colour and highly refractive. The discoloration and death 
that coherence of the tissue was destroyed. The attack 
merc tate nen es atc 
* Brown, W. On the Physiology of Parasitism, New Phyt. vol. xvi. 1917. 
