CONTENTS 



No. I (September, 1919) 



PAGE 



1. Physiological Pre-Detenniiiation : the Influence of the 



Physiological Condition of the Seed upon the Course of 

 Subsequent Growth and upon the Yield. V. Review of 

 Literature. Chapter IV. By Franklin Kidd, M.A. 

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

 D.Sc. (Lond.), F.L.S. (With Plate I and 3 Text- figures) . 1 



2. Studies in Bacteriosis. III. — A Bacterial Leaf-Spot Disease 



of Protea cynaroides, exhibiting a host reaction of possi- 

 bly Bacteriolytic Nature. By Sydney G. Paine and 

 H. Stansfield. (With Plate II and 4 Text-figures) . -'21 



3. On the Occurrence of the Immature Stages of Anopheles in 



London. By Florence E. Jarvis .... 40 



4. The Distribution of Parasite-Infected Fish. By H. Chas. 



W^iLLiAMSON, M.A., D.Sc. (With 4 Text-figures) . . 48 



5. Observations on the Habits of Certain Fhes, especially of 



those Breeding in Manure. By J. E. M. Mellor, B.A. 



(With 6 Text-figures and 4 Charts) .... 53 



Nos. 2 and 3 (December, 1919) 



1. A Phytophthora Rot of Pears and Apples. By H. Wormald, 



D.Sc. (Lond.), A.R.C.Sc. (With 2 Text-figures and Plate 



III) 89 



2. Notes on the Biology of Necrobia ruficollis, Fabr. [Coleoptera, 



Cleridae]. By Hugh Scott, M.A., Sc.D. (Cantab.). (With 



2 Text-figures) 101 



3. On the Life-history of " Wireworms"' of the Genus Ayriotes, 



Esch., with some Notes on that of Athous haemorrhoidalis, . 

 F. Part I. By A. W. Rymer Roberts, M.A. (With 5 

 Text-figures and Plate IV) . . . . . . 116 



4. On a Coenurus in the Rat. By M. Turner, B.Sc. (With 1 



Text-figure) 136 



5. Some Factors in Plant Competition. By Winifred E. 



Brenchley, D.Sc. (With 10 Text-figures and Plate V) . 142 



6. A Contribution to the Life-history of the Larch Chermes 



{Cnaphalodes strobilohius, Kalt.). By Edward R. Speyer, 

 F.E.S., M.A. (Oxon.). (With Diagram and Plates VI and 

 VII) 171 



7. Studies in Bacteriosis. IV. — "Stripe" Disease of Tomato. 



By Sydney G. Paine and W. F. Bewley. (With 5 Text- 

 figures and Plates VIII and IX) ..... 183 



8. Notes on the Life-history of Ephestia kuhniella. By Ray- 



mond V. Wadsworth ...... 203 



9. Notes. By J. C. F. Fryer 207 



10. Review 210 



