Yearly Variations of Terrestrial Phenomena and Solar Activities. XI 



The method of investigation is quite similar to the previous 

 one with regard to the frequency of earthquakes. The years of 

 maximum and mininum pressure or temperature were distin- 

 guished according as the year is situated at the top of a convex part 

 or at the bottom of a concave part of the pressure-or temperature- 

 time curve. Next, a diagram was constructed for each station in. 

 which the abscissae and the ordinates represent the area of faculae 

 or twice tlie area of spots upon the northern and southern solar 

 hemisphere respectively. Each point on the diagram represent- 

 ing a year was marked with O or x according as the year corres- 

 ponded to a maximum or minimum of the meteorological element. 

 x\fter superposing the faculae and spots diagrams thus obtained, 

 the lines of demarcation were drawn such that they divide the 

 area of the diagram into definite parts in which the marks O or x 

 are grouped. 



The results of the above investigations may be summarized 

 as follows: 



1) Pressure. 



In the case of the mean pressure, the results were quite 

 similar as in the case of the earthquake frequency. The different 

 stations could be classified into two distinct classes or types: 



Type I. in which the years of maximum pressure marked 

 with O are crowded in a narrow strip of area along the line x=y 

 or N=S, bisecting the angle between the axes of coordinates. A 

 pair of the lines of demarcation could be drawn which may more 

 or less approximately be represented by two straight lines passing 

 the origin and making certain angles with the bisector, or in other 

 words by two line x={i + Bi)y and .t=(1— Ss)?/. Beyond these 

 lines of demarcation, years with the mark x are scattered. 



Type II. which is complementary to Type I, the years with' 

 minimum pressure, i. e. the points marked with x being distribut- 

 ed between the similar lines of demarcation. 



Of course, the above classification refers to the most general, 

 features of the diagrams, disregarding many irregularities in detail. 

 The lines of demarcation are indeed generally not straight, but 



