( 160 ) 



sun's activit}^ but the course is irregular (the list which also contains 

 the periods before 1750 shows the same peculiarity). 



It appears from Table IV that the correlation of the course of 

 the coldfactors with the deviations of the minima is evident according 

 to Newcomb's data as ^vell as to those of Wolfer. 



When we consider only those periods however, where the devia- 

 tions of m and M are of the same sign, we find correlation between 

 all the elements of the sun's activity and the cold factors. (That the 

 extension is so small, proves that the acceleration of J/ and w is rather 

 to be explained as an acceleration of the whole period). Unfor- 

 tunately, if we leave out of consideration, as in Table V, the data 

 which must be considered insutTiciently reliable, the materials becomes 

 so limited that the result can prove but little, and can only be con- 

 sidered as a strong indication. 



In the preceding investigation the periods have not been chrono- 

 logically arranged ; it was not possible therefore to find any evidence 

 of a periodic modification in the deviations of the sun's oscillation. 

 According to our former results, however, we may expect that these 

 deviations will generally correspond with the great periodic wave. 

 To test this point the 11-year cycles have been arranged according 

 to the adopted 89-year period ; the deviations have been compared 

 with the cold factors found for each period. An arrangement corre- 

 sponding with the computed maxima seemed preferable to an arran- 

 gement corresponding with the minima, because of the previously 

 indicated acceleration of the strong cold waves, beyond the obser\'ed 

 solar minimum. 



In Table VI^ the vertical columns represent the eight ll-3'ear 

 cycles contained in the 89-year period ; the first begins in 1648 ; 

 in the 23'^ and 24''^ square however I placed the periods 1 626 — 1637 

 and 1637 — 1648, the periods since 1894 being of course not yet 

 available. In each square the uppermost number represents the 

 deviation of the maximum, the second the deviation of the following 

 minimum according to ISewcomb. Where the sign -\- or — follows 

 the number, the deviation amounts to at least half a year, either in 

 the positive or the negative direction. A indicates a smaller devia- 

 tion. The lower number gives the total of the cold factors between 

 two consecutive maxima. Those phases to which Newcomb assigned 

 a weight smaller than 3, have been placed in parentheses. 



Table WB contains the same data according to Wolfer ; however, 

 in the last square but one I have here written down the observed 

 phases 1894 and 1900. 



