Index 495 



Functions, Ramanujan's trigonometrical function c^ (n), and certain series of 



arithmetical functions (Hardy), 263. 

 Fungus, Crown-gall, of Lucerne (Line), 360. 



Gaussian Series of Six Elements (Rogers), 257. 

 Gluteal region of Tarsitis spectrum (Appleton), 466. 

 Grating, Plane diffraction (Searle), 88. 

 Gray, J., The mechanism of ciliary movement, 352. 



Hermaphrodite Sea-m'chins, 481. 



Greaves, W. M. H., Elected FeUow 1920, May 17, 217. 



Greenhell, G., and Bennett, G. T., The Rotation of the Non-Spinning 



Gyrostat, 243. 

 Groups, Representation of the simple group of order 660 as a group of linear 



substitutions on 5 symbols (Burnside), 247. 

 Gyrostat, Non-Spimiing, Rotation of (Bennett), 70. 

 Gyrostat, Rotation of the Non-Spinning (Greenhill and Bennett), 243. 



Hankin, E. H., Elected FeUow 1921, February 7, 488. 



The soaring flight of Dragon-flies, 460. 



The problem of soaring flight, 219. 



Hanumanta, C. v., On a property of focal conies and of bicircular quartics, 434. 

 Hanumanta, C. v., and Baker, H. F., On the generation of sets of four 



tetrahedra of which any two are mutually inscribed, 155. 

 Harding, L., Elected Associate 1920, October 25, 485. 

 Hardy, G. H., Extension of a theorem of Mr Polya (Landau), 14. 



Sur le principe de Phragmen-Lindelof (Riesz), 208. 



Note on Ramanujan's trigonometrical function Cg (n), and certain series 



of arithmetrical functions, 263. 



A theorem concerning summable series, 304. 



Harris, J. E. G., Elected FeUow 1920, November 22, 486. 



Harrison, W. J., Notes on the Theory of Vibrations, 83. 



The Hydrodynamical theory of the Lubrication of a CyUndrical Bearing 



under Variable Load, and of a Pivot Bearing. See Transactions, xxn. 

 On the StabiUty of the steady motion of viscous Hquid contained between 



two rotating coaxal circular cylinders, 455. See also Transactions, xxn. 



see Tamaki, K. 



Hart circle of a spherical triangle (Baker), 116. 



Hartridge, H., The present position of the Helmholtz theory of hearing, 488. 



An experiment which favours the resonance theory of hearing, 490. 



A criticism of Wrightson's theory of hearing, 490. 



A method of projecting interference bands, 490. 



The shift of absorption bands with change of temperature, 490. 



An apparatus for projecting spectra, 480. 



Haviland, Maud D., Elected Associate 1919, November 24, 214. 



Prehminary note on anteimal variation in an aphis {Myzus rihis, Linn.), 



35. 

 VOL. XX. part IV. 32 



