Now in order to know the relation between these secondary 

 undulations and the meteorological conditions, the course of different 

 isobars during the course of the cyclone was traced b^- referring to the 

 " Daily Weather Charts " and the " Monthly Reports " pubhshed from 

 the Central Meteorological Observatory. The time of arrival and 

 departure of the isobars of 760 mm./ 755 mm., 750 mm., 745 mm., 

 740 mm., and 735 mm. for each station was estimated and was drawn 

 in curves, which are shown in full lines, broken lines, chain-lines, &c., 

 respectively in Fig. 2. • 



From this figure we can recognize that the beginning of the con- 

 spicuous undulations of longer periods, peculiar to each station, coincides 

 nearlv with the arrival of 755 mm. isobar. 



C.Oijmmlkm- 



O.OS 



O.OA- 



lO 



20 



forB 



\\U ^^^^'\ 



^^' forW 



5 

 (O 



.t 









b:Ty o6t 



c.Ayukaaya 

 d:Mai5aka 



Fig. 3. 



89 



