lî Art. 5. — T. Terada, M. Isiuioto and M. luiauiura : 



3. Referring to the above Ta])Ie, it will be remarked that 

 the mean annual precipitation is most abuncliint in the region VI 

 and least in II. In the middle Japan, the Japan Sea side III has 

 decidedly larger precipitation than the Pacific side IV. On the 

 contrary, in the SW Japan, the Pacific side VI has 1.44 times 

 more precipitation than the Jnpan Sea side. In the NE part of 

 Japan, it is again the Japan Sea side which has more precipitation, 

 though the contrast is comparatively more pronounced than in the 

 case of III and IV. The mean values of I-II, III-IV and A^-VI 

 are respectively 101, 222 and 214, while the difference, Japan Sea 

 side minus Pacific side are respectively 51, 50 and -78. 



According to our previous theory, this result might have been 

 explained at least qualitatively, if we could assume an area of 

 inland high pressure near the junction of the central and SW parts 

 of Japan. That this is realty the case may be seen from the annual 

 isobar map. In the map, we see a general fall of pressure from 

 the Asiatic continent toward the Pacific. The general slope is, 

 however, disturbed by a remarkable tong or promontory protruding 

 from Corea toward the central part of Japan along the axial line of 

 the land. Such a distribution may conveniently be interpreted as 

 due to the superposition of an elongated area of high pressure 

 having its ridge near the -western part of Honsiu, upon the nearly 

 uniform slope from the continent to the ocean. Hence, according 

 to our rule, the Japan Sea side has more and tlie Pacific less 

 precipitation on the NE side of high area, compared with the ideal 

 case where no such high existed. The reverse may be said with 

 regard to the SW side of the high. The very marked contrast 

 between III-IV and V-VI, shows that the above efïect of the 

 " tong " is rather prominent. 



4. In discussing the matter more minutely, it is desirable to 

 take the seasonal distribution of precipitation instead of the annual. 

 In Table II. the mean monthly amounts of precipitation are given 

 for the six regions concerned: 



