EARTH PULSATIONS. 



329 



the winter, moved 



4*56''. In the previous 



the cold of 

 year 4-89''.» 



From February 17 to June 5, 1883, the author ob- 

 served in Tokio the bubbles of two delicate levels, one 

 placed north and south, and the other east and west. 

 They were placed under glass cases on the head of a stone 

 column. The column, which is inside a brick building, 

 rests on a concrete foundation, and is about ten years 

 old. It is in no way connected with the building. The 

 temperature of the room has a daily variation of about 

 1° Fahr. 



In both these levels diurnal changes are very marked. 

 Occasionally they are enormously great. Thus, on March 25, 

 the readings of the south end of the north south level were 

 as follows : — 



25th. 



Time 











Beading 



h. m. 



4 00 P.M 104-5 



4 5., 









103 



4 10 , 











102 



4 25 , 











101 



4 30 , 











100 



4 40 , 











98 



4 42 , 











99-5 



4 45 , 











100 



4 50 , 











101 



4 55 . 











101 



6 00 , 











100 



7 00 A. 



M. 









105 



26 Lh. 



Usually this level moves through about three divisions 

 per day. 



From March 25 to May 4 it travelled from 98 to 127. 



Since then, to June 5, it has descended to 116. During 



this period the east west level has been comparatively 



quiet. One division of the north south level equals about 



|2'' of arc. 



* Mmutes and proceedings of the Institute of Civil Engineers, vol. Ix. 

 p. 412, and vol. Ixiv. p. 343. 



