vi Contents 



Nos. 3 and 4 (April, 1919) 



PAGE 



1. Physiological Pre-Determination : the Influence of the 



Physiological Condition of the Seed upon the Course of 

 Subsequent Growth and upon the Yield : III. Review 

 of Literature. Chapter II. By F. Kidd, M.A. (Cantab.), 

 D.Sc. (Lond.), and C. West, A.R.C.Sc, D.Sc. (Lond.) . 157 



2. The Structure, Bionomics and Forest Importance of Grij-- 



phaliis ahietis Ratz. By W. Ritchie, B.Sc, B.Sc. (Agr.). 



(With 15 Text-figures) l7l 



3. A Copper Emulsion as a Fungicide. By H. Wormald and 



L. K. Wormald. (With Plate XI) ... . 200 



4. Studies in Bacteriosis. II. A Brown Blotch Disease of 



Cultivated Mushrooms. By S. G. Paine. (With 5 Text- 

 figures) .......... 206 



5. Physiological Pre-Determination : the Influence of the 



Physiological Condition of the Seed upon the Course of 

 Subsequent Growth and upon the Yield : IV. Review 

 of Literature. Chapter III. By F. Kidd, M.A. (Cantab.), 

 D.Sc. (Lond.) and C. West, A.R.C.Sc, D.Sc. (Lond.). 

 (With 3 Text-figures) 220 



6. On forms of the Hop {Humulus lupulus L.) resistant to 



Mildew (Sphaerotheca humali (DC.) Burr.); III. By 



E. S. Salmon 252 



7. A List of Coccidae affecting various Genera of Plants. By 



E. E. Green, F.E.S., F.Z.S. (Continued from p. 15G) . 2(51 



8. The use of Scientific and Popular Names in Economic 



Biology. By S. A. Neave, M.A., D.Sc. (Oxon.) . . 274 



9. Laws of the Association of Economic Biologists . . . 276 

 10. List of Members of the Association of Economic Biologists 278 



