E. 8. Salmon 91 



The ftiots tis regards the origin and correct name of these yellow- 

 leavetl or "golden" fonuH are hard to discover, owing jNirtly to the 

 impossibility of corre«|K»ndence with (Jerniany. A certain amount of 

 information is being collecte<l, which it is hoped to publish later. 



Summary. 



1. Individual seedlings of the wild hop {JIitmulu,s Lupuluji L.) when 

 grown in a gn'enht>use may he innnune as regards leaf and stem to the 

 attacks of the unldew Sphacnttheca Iluniuli (I)( \) Burr. This immunity 

 has been shown by the s;ime seedlings throughout the growing season 

 for two consecutive yeai-s. 



2. Such immune seedlings when planterl out in the hop-garden 

 may show susceptibility late in the growing se;ison iis regards the leaf 

 and " hop " (strobile). 



3. An immune plant in the greenhouf^e may show strictly Icxial 

 susceptibility without the general immunity being lost. (Expers 2 and 5.) 



4. A yellow-leaved female variety of H. Lnpulas is immune to 

 S. Humuli. 



5. A yellow-leaved male variety of H. Lupidus is susceptible to 

 S. Hamuli. 



