E. S. Salmon and H. Wormald 259 



Table shuwlmj the degree of m^ceptibility to mildeiv in the yrwuhouse (G), 

 arul in the llop-garden (H). 



.S^ = mere trace of mildew, .S-=fair amount of mildew; ,S'-*=:plant very mildewed. 

 S't indicates that the crop of hops was destroj'ed by mildew. .V indicates that the plant 

 under greenhouse conditions was normally susceptible to mildew, and .S'* that extreme 

 susceptibility was shown. = no mildew present. — indicates that no record was 

 available. 



Where running numbers occur, e.g., V91, V92, &c., the respective seedlings were 

 growing next to each other in the same row and 3 ft. 6 in. apart. 



** A few small patches of mildew appeared on August 7, on a few of the young leaves, 

 after a spell of abnormally cold, dull weather. The mildew patches soon died away and in 

 October the plant was entirely free from mildew. 



1 OR 38 and OR 39 were both immune in the greenhouse in 1914. 



must marked. Thus the $ seedling OD 19 remained entirely free from 

 mildew through the seasons 1917 and 1918 and showed only the merest 

 trace of mildew in 1919 and 1920, while the $ seedling OD 18 planted 

 next to it and growing so close that the lateral branches of each became 

 intertwined, was so susceptible to mildew that each year the hops and 

 the leaves were infected to the degree of S'-^ and in 1918 and 1920 the 

 crop of hops was completely destroyed by mildew. A photograph taken 



