vi Contents 



Nos. 3 and 4 (November, 1922) 



PAGE 



1. A Study of the Life-History of the Onion Fly {Hylemyia antiqua, 



Meigen). By Kenneth M. Smith, A.R.C.S. ' (With Plates X 



and XI) 177 



2. The Smut of Nachani or Ragi {Eleusine coracana (Jaertn.). By 



G. S. KuLKARNi. (With 2 Text-figures) .... 184 



3. On the Young Larvae of Lyctus hrunneus Steph. By A. M. 



Altson, F.E.S. (With 2 Text-tigures) 187 



4. Effect of High Root Temperature and Excessive Insolation upon 



Growth. By Winifred E. Brenchley, D.Sc, assisted by 

 Kharak Singh, M.A. (With 2 Text-figures) . . \ 197 



5. Studies in Bacteriosis. VII. Comparison of the " Stripe Disease " 



with the "Grand Rapids Disease" of Tomato. By Sydney 



G. Paine and Margaret S. Lacey . . . . .210 



6. The Infestation of Fungus Cultures by Mites. (Its Nature and 



Control together with some Remarks on the Toxic Properties 

 of Pyi'idiue.) By Sibyl T. Jewson, M.Sc. and F. Tattersfieid, 

 B.Sc., F.I.C. (With 4 Text-figures) 213 



7. On the Development of a Standardised Agar Medium for counting 



Soil Bacteria, with especial regard to the Repression of 

 Spreading Colonies. By H. G. Thornton. (With 13 Text- 

 figures) . . . . . . . . . .241 



8. Studies on the Apple Canker Fungus. II. Canker Infection of 



Apple Trees through Scab Wounds. By S. P. Wiltshire, 

 B.A., B.Sc. (With Plate XII) 275 



9. The Insect and other Invertebrate Fauna of Arable Land at 



Rothamsted. By Hubert M. Morris, M.Sc, F.E.S. (With 



7 Text-figures) 282 



10. On the Life-History of " Wireworms " of the Genus Agriotes 



Esch., with some notes on that of Athous haemorrhoidalis F. 

 Part III. By A. W. Rymer Roberts, M.A. (With 1 Text- 

 figure and Plates XIII, XIV) 306 



11. The Accuracy of the Plating Method of estimating the Density 



of Bacterial Populations, with particular reference to the use 

 of Thornton's Agar Medium with Soil Samples. By R. A. 

 Fisher, M.A., H. G. Thornton, B.A., and W. A. Mackenzie, 

 B.Sc. (With 2 Text-figures) 325 



