Contents vii 



On Mr Ramanujan'' s congruence properties of p [n). By H. B. C. Darling 

 (Communicated by Mr G. H. Habdy) 



On the exponentiation of well-ordered series. By Miss Dorothy Wrinch, 

 (Communicated by Mr G. H. Hardy) . . . - . 



The Gauss-Bonnet Theorem for Multiply -Connected Regions of a Surface 

 By Eric H. Neville, M.A., Trinity College .... 



217 

 219 

 234 



On an empirical formula connected with Goldbach's Theorem. By N. M. 

 Shah, Trinity College, and B. M. Wilson, Trinity College. (Com- 

 municated by Mr G. H. Hakdy) 238 



Note on Messrs Shah and Wilson's paper entitled: 'On an empirical formula 

 connected ivith Goldbach's Theorem'. By G. H. Hardy, M.A., Trinity 

 College, and J. E. Littlewood, M.A., Trinity College . . . 245 



The distribution of Electric Force between tivo Electrodes, one of which is 

 covered ivith Radioactive Matter. By W. J. Harrison, M.A., Fellow 

 of Clare College. (One fig. in Text) 255 



The conversion of saw-dust into sugar. By J. E. Purvis, M.A. . . 259 



Bracken as a source of potash. By J. E. Purvis, M.A 261 



The action of electrolytes on the electrical condtictivity of the bacterial cell 

 and their effect on the rate of migratioii of these cells in an electric field. 

 By C. Shearer, Sc.D., F.R.S., Clare College 263 



The bionomics of Aphis grossulariae Kalt., and Aphis viburni Schr. By 

 Maud D. Haviland, Bathurst Student of Newnham College. (Com- 

 municated by Mr H. H. Brindley) 266 



Note on an exp)eriment dealing with mutation in bacteria. By L. Don- 

 caster, Sc.D., King's College. (Abstract) 269 



Golourimeter Design. By H. Hartridge, M.D., Fellow of King's College, 



Cambridge. (One fig. in Text) 271 



The Natural History of the Island of Rodrigues. By H. J. Snell (Eastern 

 Telegraph Company) and W. H. T. Tams. (Communicated by 

 Professor Stanley Gardiner) 283 



Preliminary Note on the Life History of Lygocerus {Proctotrypidae), 

 hyperparasite of Aphid i us. By Maud D. Haviland, Fellow of 

 Newnham College. (Communicated by Mr H. H. Brindley) . . 293 



Note on the solitary wasp, Crabro cephalotes. By Cecil Warburton, 



M.A., Christ's College 296 



Neon Lamps for Stroboscopic Work. By F. W. Aston, M.A., Trinity 

 College (D.Sc., Birmingham), Clerk-Maxwell Student of the Uni- 

 versity of Cambridge. (One fig. in Text) ..... 300 



