1886.J Sun-spot Areas and Diurnal Declination-ranges. 223 



series of 24 years has its 24 years in common with the Prague series, 

 but only 12 years in common with the sun-spot series. 



Confining our comparisons in period to sun-spots, Toronto tempera- 

 ture, and Prague declination-ranges, it will be seen that on the whole 

 the positions of maximum apparent Inequality for sun-spots are near 

 those for Toronto temperature and Prague declination. It may be 

 desirable here to repeat the remark which we made in our previous 

 communication, that while this likeness cannot be considered as 

 conclusively proving a connexion, it is nevertheless the sort of 

 similarity which might be expected to exist between phenomena 

 physically connected, but which contain so many apparent Inequali- 

 ties, and these so near together, that our series of observations is not 

 sufficiently extensive to enable us to eliminate their influence upon 

 each other, or to allow us to ascertain their true positions. 



We may likewise remark that in our opinion there is not a greater 

 correspondence between sun-spots and declination -ranges than be- 

 tween sun-spots and temperature-ranges. 



4. Comparison in Phase. — For this purpose we have treated the 

 Toronto declination and the Prague declination Inequalities exactly 

 in the way in which we treated the temperature-range Inequalities of 

 our previous paper, so that the Inequalities of the following table 

 (Table II) are quite comparable with, those of our previous paper ; 

 they are indeed virtually the same Inequalities. The only difference 

 is that we have in Table II set for calculation in each case from the 

 corresponding sun-spot minimum, which seems to be the most con- 

 venient starting point when comparing together Inequalities such, as 

 those of this table, which as a rule have only one prominent maximum 

 in their period. It thus appears that here the settings have been 

 arranged by strictly celestial considerations. If, therefore, there is no 

 connexion between these terrestrial and solar Inequalities, the declina- 

 tion-range maxima should be distributed impartially up and down the 

 table without any other than chance grouping together. Their 

 behaviour is, however, very different from this — the maxima being 

 comparatively closely grouped together about a position a couple of 

 days after the corresponding sun-spot maximum. 



5. Constancy of Type in the various Inequalities. — There is a very 

 considerable constancy of type in the declination Inequalities which, 

 as already stated, have only one prominent maximum. Nevertheless, 

 as will be seen both from Table II and from the diagram which 

 accompanies this paper, there is a tendency to duplicity of phase in 

 the terrestrial that is entirely wanting in the solar Inequalities. 



