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 (Zoolog-y) 



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



Rothamsted Experimental Station, Nat. Hist. Museum, 



Harpenden South Kensington, S.W. 7 



Council 



A. W. BACOT, Esq. E. J. BUTLER, D.Sc, CLE., M.B. 



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



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



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



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



A. B. BRUCE, M.A. E. J. RUSSELL, D.Sc, F.R.S. 



CONTENTS OF Vol. IX, No. 1 



PAOS 



1. The Control of the Greenhouse White Fly {Asterochiton vaporariorum) 



with Notes on its Biology. By Ll. Lloyd, B.Sc. (Leeds). (With 

 5 Text-figures, 2 Diagrams and Plates I and II) 



2. Observations on the Ensheathed Larvae of some Parasitic Nematodes 



By T. GooDEY, D.Sc. (With 1 Text-figure) 33 



3. Leaf Character in Reverted Black Currants. By A. H. Lees, M.A 



(With 46 Text-figures and 11 Graphs) 49 



4. Further Observations on Sitones lineatus L. By Dorothy J. Jackson, 



F.E.S. (With 2 Text-figures) 69 



5. Contributions to the Biology of Freshwater Fishes. I. The Effects 



of various Impurities in a Stream on the Life of Spermatozoa of 

 Trout and Young Trout. II. Biological Problems connected with 

 a Trout Farm. By W. Rushton, A.R.C.S., D.LC, F.L.S. . . 72 



6. Obituary Notice. Dr Caroline Burling Thompson, 1869-1921 . 81 



7. List of Members of the Association of Economic Biologists for 1921-2 83 



8. Laws of the Association of Economic Biologists. .... 90 



