260 On Forms of the Hop 



5. Certain seedlings (Group 4) are semi-immune to the attacks of 

 the mildew. 



6. One seedling (of American ancestry) grown in the greenhouse 

 was immune throughout the season in 1916 and very susceptible in 1917, 



BIBLIOGRAPHY. 



(1) Salmon, E. S. On Forms of the Hop {Humulus Lupulus L.) resistant to Mildew 



{Sphaerotheca Humiili (DC.) Burr.). Journ. Agric. Science, vni, 400-460 

 (1917). 



(2) Idem, ii. Journ. Genetics, vm, No. 2, 83-91 (1919). 



(3) On the Resistance to Fungicides shown by the Hop-mildew (S. HumuU 



(DC.) Burr.) in different stages of development. Annals of Applied Biology, 

 III, 93-96 (Plate XV) (1917). 



(4) Barrus, M. F. Variation of varieties of Beans in their susceptibiUty to An- 



thracnose. PhijtopaOwJogy,!, 190(1911). 



(5) Butler, E. J. Fungi and Disease in Plants, 124, 162 (1918). 



