20 



Art. 5. — T. Terada, M. Isimoto and M. Imamiira 



x'=x COS lS° + ;y sin 18° 

 y'=y cos 18^— a: sin IS"" 



it was found that the general course of the //'-component (Table X 

 and Fig. 4) is quite similar to that of c. 



Table X. 



As to the terms R and R' whicli represent the parts of the 

 precipitation independent of the local topography, we may remark 

 that the general annual variation is such as to be easily explained 

 by yearly course of temperature and humidity, though the high 

 values in September and October may j^robably be due to the 

 cyclones prevalent in this season. 



From the above results, it may be seen that on the Pacific 

 side, the seasonal fluctuations of the general term R and R' are 

 generally enhanced by the topographical efïect in warmer as well as 

 in the colder seasons, whereas on the Japan Sea side the seasonal 

 variation is partially compensated by the topographical influence. 

 This is the formal explanation based on the present theory why 

 the seasonal variation is small on the latter side. 



In a previous paragraph we have mentioned that on the Japan 

 Sea side, the yearly fluctuation of the precipitation shows no 

 regular relation with the gradient components x and ?/, and 

 inferred that on this side some other agents must predominate 

 over the above gradient. It is interesting to observe that here in 

 the seasonal fluctuation, the effect of topography appears conspicu- 



