16 Art. 6.— T. Terada . 



to the pressure type II and IV, i.e. to the ' water zone ', while of 

 the remaining nine stations*^ eight are situated near the boundary 

 of o or the 'land zone'. 



Tlie above relation suggests that the zonal distribution of the 

 yearly pressure is chiefl}^ determined by the zonal distribution of 

 the atmospheric temperature caused by some unknown mechan- 

 ism of the solar influence. It is no wonder that the temperature 

 distribution is not so simple as the pressure distribution, since the 

 temperature observed at the surface of the earth are considerably 

 affected by the local factors such as cloudiness, precipitations, the 

 directions of wind etc. which are governed in their turn by the 

 pressure distribution. The fact that the fluctuation of the pressure 

 shows nevertheless a regular distribution seems therefore to in- 

 dicate that the temperature of the air is affected up to the higher 

 layer by the influence of the sun, in such a manner as to produce 

 the above zonal distribution. 



The above way of regarding the relation between the tempe- 

 rature and pressure is interesting inasmuch as it promises to 

 explain in some measure the peculiar correlation often found be- 

 tween the pressure of a certain station with the temperature of 

 another station situated in quite remote part of the earth"^. If the 

 yearly variations of pressure and temperature are related to the 

 variation of solar activity as considered above, it is quite natural 

 that these elements in different parts of the earth show positive or 

 negative correlation as the case may be. The fact that the actual 

 correlations are by no means so universal and also that remarkable 

 relations are often found between one element in a certain month 

 of a certain station and another element in another month of a 

 distant station, is not surprising, if we consider that numerous 

 local influences are always present tending to drown the general 

 effect of the solar activity. Farther discussions on these lines will 



1) Those marked with * iu foot note (2) of the previous page. 



2) For example, April aud August pressure of Toronto is closely associated with the 

 August temperature at Erimo, Hokkaidà (See T. Okada, Journ. Met. Soc. Jaj)., 36, No. 6.) It 

 may be remarked that yearly pressure of Toronto and yearly temperature of Tokyo belongs to 

 Type III. 



