DISTURBANCES IN THE OCEAN. 185 



nomena were observed at various localities. These, 

 however, are but of minor importance. At the end of 

 the paper by Dr. Geinitz two interesting tide gauge 

 records are introduced, one from Sydney and the other 

 from Newcastle. These appear to show a marked dif- 

 ference in the periods of the sea waves at these two 

 places.^ 



Comparison of velocities of wave transit which 

 have been actually observed, with velocities which ought 

 to exist from what we know of the depth of the Pacific 

 by actual soundings, — From a chart given in ' Peter- 

 mann's Greograph. Mittheilungen,' Band xxiii. p. 164, 

 1877, it is possible to draw approximate sections on lines 

 in various directions across the bed of the Pacific. 



From the origin of the shock to Japan (Kameishi) 



me would be as 



loiiows : — 





about 7,441 miles 





. 15,000 feet deep 



1,100 „ 





. 18,000 



160 „ 





. 27000 



80 „ 





, 12,000 „ 



60 „ 





. . 6,000 ., 



On account of the Tuscarora and Belkap Deeps this 

 would be the most irregular line over which the wave 

 had to travel. 



From the origin to New Zealand (Wellington) the 

 line would be 



about 5,274 miles . . . . , 15,000 feet deep. 

 „ 300 „ 12,000 



From the origin to Samoa the line would be 

 about 5,773 miles 16,000 feet deep. 



From the origin to the Sandwich Islands (Honolulu) 

 the line would be 



» J. Milne : ' Peruvian Earthquake of May 9, 1877.' See Trans. Seis. 

 Soo. of Japan, voL ii. 



