CH.XV.] MILDEW OF TURKU'S AMD CABBAGES. 81 



x-aoo- 



FIG. 29. PUTREFACTIVE MILDEW OF TURNIPS AND CABBAGES. 

 Peronosp&ra parasitica, Pers. Enlarged 200 diameters. 



constituent cells of the leaf, and the mycelium sets up 

 decomposition in every part of the leaf with which it 

 comes into contact. 



G 



