CONTENTS. ' >^' 



PAGE 



The Problem of Somng Flight. By E. Hi Hakkin, M.A., Sc.D., late 

 Fellow of St John's •College, Causbi^dglf- Chemical Examiner to 

 Government, A'Jre,* ludfia. (Communicated Dy M.vfi. H. Brixdlky) 

 With an Introduction by F. Handlet Page, C.B.E., F.R.Aer.S. . 219 



Preliminary I^ote on the Superior Vena Cava of the Cat. By W. F. 



Lanchester, M.A., King's College, and A. G. Thacker . . 228' 



A Note en liikd 'Staining. By F. A. Potts, M.A., TiinityH'all. -(With < 



Text-figure) .231^ 



Preliminary Note on a Cynipid hyper-parasite of Aphides. By Maud D. 

 Haviland, Fellow of Newnham College. (Communicated by 

 Mr H. H. BrIndley) , •''.'■. .. '. ... /.J?;. " . 235 



A method of testing Triode Vacitum Tubes. By E, V. Appletok,' M.A. 



St John's College. (With Two figures in Text) . . . . 239 



The Rotation of the Non-Spinning Gyrostat. By Sir George Greex- 



HILL and Dr G. T. Beknett . . . . . . *. . 243 



On the representation of the simple group of order 660 as a group of 

 linear siibstitutions on 5 symbols. By Dr W. Burnside, Honorary 

 Fellow of Pembroke College . ^ 247 



On the representation of algebraic numbers as a sum of four squares. By 

 L. J. MoRDELL. (Communicated by Professor H. F. Baker) 



On a Gaussian Series of Six Elements. By L. J. Rogers. (Commmii 

 cated by Professor G, H. Hardy) 



Note en Rctmanujaji's tngonometrical function c^ (?j), and certain series 

 of arithmeiical f-Anctions. By Professor G. H, Hardy 



On the distribution of primes. By H. Cramer, Stockliolm. (Gommimi- 



cated by Professor G. H. Hardy) 272 



Note on the parity of the number tvhich enumerates the partitions of a 



number. By Major P. A. MacMahon 281 



250 

 257- 

 263 



