1904.] Sunspot Variation in Latitude, 1861 — 1902. 



149 



Welle lief em wiirde, und zwar hatte diese ihre grosste Erhebung gegen 

 Ende des Jahres 1875." As will be seen from a further quotation 

 from the same page, Sporer distinctly noticed subsidiary increases of 

 spotted area and a reversion of spots to higher latitudes, and this drew 

 from him the conclusion that the epoch of the following sunspot 

 minimum would be late. 



He wrote (page 81), " die Ursache, welche eine Erhebung der 

 Breitencurve bewirkte, d. h. welche veranlasste, dass in Jwheren Breiten 

 ah varher Flecke entstanden, dadurch auch Veranlassung gewesen ist, dass 

 wiederum Vermehrung der Flecke eintrat und damit auch das Flecken- 

 Minimum flir langere Zeit verzogert wurde." 



Again, from, the solar observations made at the Kalocsa Observatory 

 during the years 1880 — 1884, both years inclusive, Dr. Braun* 

 depicted in a graphic manner the progressive changes in the mean 

 heliographic latitude of the spots during this period, and drew attention 

 to the differences between the mean curve and that passing strictly 

 through the points of observation (fig. 2). The mean curve he found 



Fig. 2. 



1880 | 1881 l 1882 j 1885 



15° 



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£ 5 8 II 14 17 20 23 26 29 32 35 38 41 44 47 50 

 ROTATIONS. 



Diagram to illustrate for the years 18S0 — 1883 the differences between the curve- 

 showing the decrease of the mean heliographic latitude for the entire spotted 

 area of both hemispheres taken together (continuous curve), and that obtained 

 by a less smoothed curve (dotted) passing through the points of the actual 

 observations. 



* ' Berichte von dem Erzbischoflich Haynaldschen Observatorium zu Kalocsa in, 

 Ungarn,' von Carl Braun, S.J. Munster i. W., 1886. 



