Ou the Effect of Topography on the Precipitation in Japan. 21 



oLis, the effects of the otlier agents being apparently eliminated by 

 taking average of different years. 



The formnla (B) fails in the case of the yearly variations, the 

 values of c's obtained showing no regular relation with the com- 

 ponents of the barometric gradient. Besides, their values are 

 generally a small fractions of the general terms R and R' . Tlie 

 simple assumption is therefore inadequate in this case. One point 

 of interest is that the values of a thus obtained are generally 

 positive and their mean value is very nearly equal to unity, being, 

 1.002, which points to the inference that on an average r-i—r^ 

 =re—ri. The latter fact could only be explained by the presence of 

 the high pressure area on the axial line of the land, as already 

 mentioned in § 3. 



From the mere mathematical points of view, the above method 

 of analysis is nothing more than the substitution of the six given 

 amounts of precipitation by the new six quantities R, R', a and c's. 

 Neither is the substitution the unique one possible. The chief 

 physical interests, however, consist in the fact that the apparently 

 irregular distributions of the precipitation may thus be explained 

 at least in its main feature by the combination of the topographical 

 effects on the basis of the simple elementary theory. These results 

 may turn out useful for the practical pui'pose, as soon as the long 

 period forcast of the barometric conditions becomes a matter of 

 practice, the possibility of which is nowaday anything more than 

 the dream of the modern meteorologists. 



12. As already cited at the beginning of this note. Prof. 

 Omori shew that there exists a remarkable parallelism between the 

 yearly amount of precipitation at Niigata, a Japan Sea station, and 

 that of the earthquake at Tokyo. In the present inv^esigation, the 

 earthquakes originating in the submarine zone extending from 

 Kinkwazan to Idu were chosen from the Kisyô-yôran. The yearly 

 number of occurrence is given in the first line of the Table XI and 

 plotted in Fig. 5. Comparing the graph with that of precipitation 

 in different stations or regions, it was found that the correlation is 

 rather remarkable in the case of the mean fluctuation of précipita- 



