CONTENTS {continued). 



PAGE 



Notes on the Statolith Theory of G-eotropism. I. Expei iments on the Effects 

 of Centrifugal Force. II. The Behaviour of Tertiary Roots. By 

 Fbancis Dabwijt F.R.S., and D. F. M. Pertz 477 



On the Electric Effect of Rotating a Dielectric in a Magnetic Field. By 

 Harold A. Wilson, M.A., D.Sc., Fellow of Trinity College, Cambridge. 

 Communicated by Professor J. J. Thomson, F.R.S. (Abstract) . . 490 



Bakerian Lecture. — The Succession of Changes in Radio-active Bodies. 

 By E. Rutherford, F.R.S. , Macdonald Professor of Physics, McG-ill 

 University, Montreal. (Abstract) 493 



On the Electric Equilibrium of the Sun. By Svante Arrhenius. Com- 

 municated by Sir William Huggins, Pres. R.S 496 



Minutes of Meetings of May 19, 1904, and June 2, 1904 .... xviii 



NOTICES TO FELLOWS OF THE ROYAL SOCIETY. 



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Demy 8vo, Cloth, 12 s. 6d., with Plates and Woodcuts, 427 pp. 



THE RECORD OF THE KOYAL SOCIETY. 



SECOND EDITION, 1901. 



Containing an account of the Foundation and Early History of the Society, its 

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REPORT TO THE GOVERNMENT OF CEYLON 



ON THE 



PEARL OYSTER FISHERIES OF THE GULF OF MANAAR. 



By W. A. Herdman, D.Sc, F.R.S. 



With. Supplementary Reports upon the Marine Biology of Ceylon 

 oy other Naturalists. 

 Part I. 1903. 



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