336 



(Fig. ^o B e k) which no longer participate in the changes and are sep- 

 arated prematurely by the cork layers (k) from the tissue lying beneath 

 them^ 



The full thickness of the bark is not always attacked by the pouch-like 

 elongation ; in very severe cases, however, even the cells of the cambial 

 region are deformed (c). The wood is no longer normal. Instead of normal 

 mature wood, consisting of thick-walled, elongated wood cells and ducts, 



Fig:. 50. Dropsy in Ribes aureum. (Orig.) 



with cross walls broken through like ladders, a wood is produced, composed 

 of short, broad, comparatively thin-walled, parenchymatous cells {h p). The 

 cross-section (Fig. 50 B) shows the transition of the healthy side of the 

 branch (A'') into the dropsical side (W) ; h indicates the normal wood. At 

 the time when the layer st was produced, the disease manifested itself in the 



1 Compare Sorauer in "Freihoff s Deutsche Gartnerzeitung^' August 1, 1880, and 

 Goschke in Monatsschrift d. Ver. z. Beford. d. Gartenb. October, 1880, p. 4.51. 



