392 
JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
The important question of disease-prevention remains for 
consideration. At the present time, the Potato fungus is fought 
by two methods, differing fundamentally in principle. By the 
system originated in France, an effort is being made to frustrate 
the insidious attacks of the Plujtojjhthora, or Peronospora. The 
crop while growing is either sprayed with the liquid Bordeaux 
No. 2. — Reproduction of GERARDE'f? Engraving of Virginian Potato 
Foliage. 
Fig. 31. 
mixture known as " ])0uilHc Bordolaise," or the plants arc dusted 
with a powder consisting of similar chemical constituents. The 
other system is attempting to accomplish the same end by raising 
and distributing seedlings having a robust constitution, capable 
of resisting the attacks of the fungus. In this system I have for 
years taken a deep interest, and it has occurred to me that it 
nn'gbt be possible to succeed in popularising this brancli of ex- 
