The Association of Economic Biologists 



President 



Professor NEWSTEAD, F.R.S. 



Vice-Presidents 



Professor CARPENTER, M.R.I.A. 

 Professor HICKSON, F.R.S. 

 R. STEWART MacDOUGALL, D.Sc. 

 Sir PATRICK MANSON, K.C.M.G., F.R.S. 

 ■ A. E. SHIPLEY, D.Sc, F.R.S. 



Council 



R. S. BAGNALL Prof. P. GROOM, D.Sc. 



S. E. CHANDLER, D.Sc. A. D. IMMS, D.Sc. 



F. J. CHITTENDEN Prof. J. H. PRIESTLEY 



E. E. GREEN A. G. L. ROGERS 



Hon. Treasurer 



J. C. F. FRYER, Esq., 



Craven House, 



Northumberland Avenue 



Hon. Secretary 



Professor H. M. LEFROY, 



Imperial College of Science, 

 South Kensington 



CONTENTS OF Vol. II, No. 4 



PAOH 



1. Observations on some Diseases of Plantation Rubber in Malava. By 



F. T. Brooks, M.A. (With Plates XXXIII— XXXV.) ' .209 



2. Note on Dr J. Smolak's paper "A Contribution to our Knowledge of 



Silver-leaf Disease" 228 



3. Spraying for Apple Sucker (Psylla mali). By F. R. Petherbridge,M.A. 230 



4. On the Biology and Economic Significance of Tipula palvdosa. 



Part I. Mating and Oviposition. By John Rennie, D.Sc, F.R.S.E. 

 (With Plate XXXVI.) 235 



5. Some East African Insects of Economic Importance. By R. H. 



Deakin, M.Sc 241 



6. Winter Cover Washes (conclusion). By A. H. Lees, M.A. . . 245 



7. Some Observations on the Egg of Psylla mali. By A. H. Lees, M.A. 



(With 8 Text-figures.) . 251 



8. Sciara tritici, Coq. A Fly Injurious to Seedlings. By F. W. Edwards, 



B.A., F.E.S., and C. B. Williams, M.A., F.E.S 258 



9. On a Case of Recovery from Mosaic Disease of Tomato. By W. B. 



Brierley 263 



10. "Wilt" or "Crown-rot" Disease of Carnations caused by Fusarwm 



sp. By Paul A. van der Bijl, M.A., F.L.S. (With Plates 

 XXXVII— XL.) ... 267 



11. Review. The Embryology of the Honey-Bee. By Dr J. A. Nelson . 292 



