The Association of Economic Biologists 



President 



Prof. E. B. POULTON, M.A., D.Sc, LL.D., F.R.S. 



Vice-Presidents 



Prof. V. H. BLACKMAN, Sc.D., F.R.S. 

 G. A. K. MARSHALL, C.M.G., D.Sc. 



Hon. Treasurer Hon. Editors 



A. D. IMMS, D.Sc, W. B. BRIERLEY, D.Sc. 



Rothamsted Experimental Station, D. WARD CUTLER, M.A., 



Harpenden Rothamsted Experimental Station, 



Harpenden 



Hon. Secretary (General and Botanical) Hon. Secretary (Zoology) 



W. B. BRIERLEY, D.Sc, J. WATERSTON, M.A., D.Sc, 



Rothamsted Experimental Station, Nat. Hist. Museum, 



Harpenden South Kensington, S.W. 7 



Council 



W. LAWRENCE BALLS, Sc.D. G. A. K. MARSHALL, C.M.G., D.Sc 



W. F. BEWLEY, D.Sc J. W. MUNRO, D.Sc 



Prof. V. H. BLACKMAN, Sc.D., F.R.S. S. A. NEAVE, D.Sc 



F. T. BROOKS, M.A. Prof. J. PERCIVAL, M.A. 



A. B. BRUCE, M. A. " Prof. J. H. PRIESTLEY, D.S.O., B.Sc 



E. J. BUTLER, D.Sc, CLE., M.B. E. J. RUSSELL, D.Sc, F.R.S. 



CONTENTS OF Vol. IX, No. 2 



PAOB 



1. Bionomics of Weevils of the Genus Sitona injurious to Leguminous 



Crops in Britain. Part II. Sitona hispidula F., S. suldfrons Thun 

 and S. crinita Herbst. By Dorothy J. Jackson, F.E.S. (With 

 5 Text-Hgures and Plate III) 93 



2. "Sleepy Disease" of the Tomato. By W. F. Bewlet, D.Sc. (With 



Plates IV-VII) 116 



3. Biological Studies of Aphis rumicis Linn. Reproduction on Varieties 



of Vicia faba. By J. Davidson, D.Sc. With a Statistical Appendix 



by R. A. Fisher, M.A. (With 1 Text-figure) .... 135 



4. The Toxic Action of Traces of Coal Gas upon Plants. By J. H. 



Priestley 146 



5. Common Scab of Potatoes. Part I. By W. A. MiLLARD, B.Sc. (With 



Plates VIII, IX) 156 



6. Additional Host Plants of Osdnella frit, Linn, among Grasses. By 



Norman Cunliffe, M.A. (Cantab.) 165 



7. Studies in Bacteriosis. VI. Bacillus carotovorus as the cause of 



Soft-Rot in Cultivated Violets. By Margaret S. Lacey . . 169 



8. Review 171 



9. Report of the Council 173 



10. Obituary. A. W. Bacot 175 



