The Association of Economic Biologists 



President 



Sir DAVID PRAIN, C.M.G., CLE., LL.D., F.R.S. 



Vice-Presidents 



G. A. K. MARSHALL, D.Sc., F.Z.S., F.E.S. 

 A. G. L. ROGERS, Esq. 



Hon. Treasurer Hon. Sec. for Publications 



A. D. IMMS, D.Sc, E. E. GREEN, Esq., 



Rothamsted Experimental Station, Way's End, 



Harpenden Camberley 



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



W. B. BRIERLEY, Esq., S. A. NEAVE, D.Sc, 



Rothamsted Experimental Station 89, Queen's Gate, S.W. 7 



Council 



Prof. B. T. P. BARKER J. C. F. FRYER 



Prof. V. H. BLACKMAN, F.R.S. Prof. F. KEEBLE, F.R.S. 



Prof. A. E. BOYCOTT, F.R.S. R. T. LEIPER, D.Sc. 



S. E. CHANDLER, D.Sc G. A. K. MARSHALL, D.Sc 



F. J. CHITTENDEN M. C. RAYNER, D.Sc. 



A. D. COTTON A. G. L. ROGERS 



CONTENTS OF Vol. VII, No. 1 



PAGE 



1. On a New Polyembryonic Encyrtid (Chalcidoidea) Copidosoma Tor- 



tricis sp. N. Bred from the Strawberry Tortrix Moth. By James 

 Waterston, B.D., B.Sc. (With 5 Text-figures) .... 1 



2. The Life History of the Strawberry Tortrix, Oxygrapha comariana 



(Zeller). By F. R. Petherbridge. (With Plate I) 6 



3. Daily Periodicity in the Numbers of Active Soil Flagellates : with a 



brief Note on the Relation of Trophic Amoebae and Bacterial 

 Numbers. By D. Ward Cutler and L. M. Crump. (1 Map and 7 

 Text-figures) 11 



4. Spartina Problems. By Jrof. F. W. Oliver, F.R.S. (With Plate II 



and 3 Text-figures) 25 



5. Investigation of the Nature and Cause of the Damage to Plant 



Tissue resulting from the Feeding of Capsid Bugs. By Kenneth 



M. Smith, A.R.C.S., D.I.C. (With Plate III and 5 Text-figures) . 40 



6. Sphaeronema sp. (Mouldy Rot of the Tapped Surface). By A. R. 



Sanderson, F.L.S. and H. Sutcliffe, A.R.C.S. (With Plates 

 IV-VII) 56 



7. The Habits of the Glasshouse Tomato Moth, Hadena (Polia) oleracea, 



and its Control. By Ll. Lloyd, D.Sc. (With Plates VIII-X and 



4 Diagrams) ........... 66 



8. A Quantitative Analysis of Plant Growth. Part I. By G. E. Briggs, 



M.A. (Cantab.), Franklin Kidd, M.A. (Cantab.), D.Sc. (Lond.) and 

 Cyril West, A.R.C.Sc, D.Sc. (Lond.). (With 9 Text-figures) . 103 



9. Notes on Chemotropism in the House-Fly. By E. R. Speyer . 124 



