CONTENTS— {continued). 



PAGE 



II. On the Amplitude of Sound-waves. By Lord Eayleigh, M.A., F.E.S. . . 248 



III. On the alleged Correspondence of the Eainfall at Madras with the Sun-spot 

 Period, and on the True Criterion of Periodicity in a series of Variable 

 Quantities. By General Steachey, E.E., C.S.I., F.E.S 249 



List of Presents . 262 



On the Calculation of the Trajectories of Shot. By W. D. Niven, M.A., F.E.A.S. 268 



Obituary Notice :- 

 Dr. Sibson 



GOVERNMENT GRANT OF £1000. 



A Meeting of the Government-Grant Committee will be held in February 1878. It 

 is requested that applications to be considered at that Meeting be forwarded to the 

 Secretaries of the Eoyal Society before the 31st of December, 1877. 



GOVERNMENT FUND OF £4000 



FOR THE PROMOTION OF SCIENTIFIC RESEARCH. 



A Meeting of the Government-Fund Committee will be held in February 1878. It 

 is requested that applications to be considered at that Meeting be forwarded to the 

 Secretaries of the Eoyal Society before the 31st of December, 1877. 



Always on Sale. 



PHILOSOPHICAL TEANSACTIONS and PEOCEEDINGS. 



ALSO 



CATALOGUE OF SCIENTIFIC PAPEES : 

 Six vols., 4to. Per vol. : 20s., cloth ; 28s., half-morocco. 

 A continuation of the work (1864-1873) is now in the press. 

 May be obtained through any bookseUer. 



TAYLOE AND FEANCIS, EED LION COUET, FLEET STEEET, 



AND ALL BOOKSELLEKS. 



