PHILOSOPHICAL 



TRANSACTIONS 



OF THE 



ROYAL SOCIETY OF LONDON 



SERIES A. 



CONTAINING PAPEKS OF A MATITKMATK 'AL <>K PHYSK'AL CHARACTER. 



VOL. 20:i. 



/T 



LONDON: 



PK1NTED BY HARRISON AMU SONS, ST. MAKTIN's LANE, W.C.. 

 fjrinltrs in rbinarji to f is Slajt 



SEPTEMBER, 1904. 



