^ K. HONDA, T. TEPtADA, Y. YOSHTDA, AND D. ISITANI. 



seiches between Sicily and the African coasts. The phenomenon 

 was also observed on another coast of Italy and at the northern 

 coasts of Enrope/'' 



In 1895, W. Bell Dawsonf commnnicated a paper to the 

 Royal Society of Canada, which showed the existence of the 

 secondary undulations of considerable amplitude. Professor 

 Duif J concluded from the observations at many stations along 

 the coasts of the Bay of Tandy and tlie Gulf of St. Lawrence, 

 that the secondary undulation had a period peculiar to each 

 station, and that it is of the nature of seiches excited by the 

 low atmospheric pressure. H. C. Russell*'-' states that at Sydney, 

 the undulations are in most cases dne to atmospheric disturb- 

 ances. Napier Denisonff of Toronto Observatory made a 

 systematic study of the subject in connection with the barometric 

 change. He attributed the phenomenon to long waves generated 

 by air waves of considerable wave length, accompanying the 

 low barometric pressure. Since several years ago Professor 

 Giovanni Platania'-'f has investigated the secondary undulations 

 in the Gulf of Catania. He attributed the phenomenon to the 



*) G. Groblovitz, Eicerche snlle Maree cl'Iscliia, Eend. Ace. Lincei, 6, p. 26-32, 1890. 

 Sulle osservazioni mareografiche in Italia e specialmente su quelle fatte ad Iscbia, Atti del 

 I Congr. Ital., Geneva, 1893. 



E. Sieger, Niveauveränderungen an Skandinavischen Seen und Küsten, Verb. 9te 

 Deutsch. Geogr., Wien, p. 224. 



E. Brückner, Uebar Schwankungen der Seen und Meere ; Verb. 9tb Deutsch Geogr., 

 Wien, p. 209, 1892. 



t) Dawson, Notes on secondary undulations, Proc. Eoy. Soc. Canada, May. 1895. 



X) Duff, Seiches on the bay of Fnndy, Amer. -Tourn. Sei., 3, p. 406-412, 1897. Perialic 

 tides. Nature, 59, 1899. 



**) Eussell, The source of periodic waves, Nature 57, 1898. 



tt) Denison, Secondary undulations of tide-gaiiges, Proc. Can. Inst., 1, p. 28, 1898. 

 The origin of tidal secondary undulations. Ibid, 1, p. 134. 



*t) Platania, Le librazioni del mare con particolare riguardo al Golfo di Catania, Atti 

 del V Congresso Geogr. Ital., Najîoli, 1904. Nnove ricerche sulle librazioni del mare, An- 

 nuario der E. Istituto Nautico, I, 1907. 



