778 



Mr. Charles Chree 



[March 4, 



Royal's figures for sun-spot areas. AYolfer's figures show a well 

 marked maximum in 1893. The preceding and succeeding minima 

 were in 1890 and 1901 respectively. The remarkable parallehsm 

 between the progressive changes from year to year in sun-spot fre- 

 quency and in the diurnal inequality ranges at Kew and Pavlovsk — 

 representing respectively Western and Eastern Europe — appeals to 

 the eye. The difference between the ranges at sun-spot maximum 

 and minimum is substantial, the latter in the present case being only 

 about two-thirds of the former. 



Table VII. 



-Connection Between Sunspot Frequency 

 AND Declination Kanges. 



Year . 



1892. 1893. 1894. 1895. i 1896. 1897. 1898. 1899. 1900 



li35-6 73084-9 78-064-0 



7'-3i8'-5 9'-810'-7 9'-8 9'-5 

 1 6-3| 7-3 8-7 9-6 8-6 8*2 



ilO-7 

 12-1 



13-7 17-715-C 16-515-6 

 16-0 21-017-8 20-418-1 



Sunspot frequency 

 (Wolfer) . . ". 



Diurnal inequality 

 range — 

 At Kew 

 At Pavlovsk . 



Absolute daily 

 range — 

 At Kew 

 At Pavlovsk . 



At Pavlovsk — 



Mean range in 



month. . . 28-2 



Total range in 



year . . . 42-1 92-3 194-087-1 145-673-988-7 lOl'l 118-963-8 



i i I 



41-8 26-2 



8'-5 7'-8 

 7-4 6-8 



14-5 12-1 

 17-5 14-6 



26 •7,12-1 



7'-6i7'-3 

 6-3; 6-0 



12-311-3 

 14-7131 



I I 



46-3 93-6J48-3 84-ll47-452-4 43-8 46-6 



38-3 



5-5 



6'- 8 

 6-2 



9-2 

 10-5 



32-8 

 94-2 



Passing to the absolute daily range, we have now to deal with 

 a quantity which is considera])ly influenced by magnetic storms. 

 Here, again, the ranges in the years of many sun-spots are conspicu- 

 ously the larger, but the parallelism with the variation of sun-spot 

 frequencies is less close. In particular, 1893, the year of sun-spot 

 maximum, shows at both Kew and Pavlovsk a distinctly smaller 

 absolute range than either of the adjacent years, especially 1892. 

 Of the last two lines in Table YIL, the first gives the arithmetic 

 mean of the differences observed at Pavlovsk between the extreme 

 positions of the compass needle during each month of the year, while 

 the second gives its total range during the year. These ranges, 

 especially the last, are determined by the size of the principal magnetic 

 storms. In both cases 1892 occupies the premier, and 1894 the 

 second position. 1893 lags far behind ; in the case of the annual 

 range it even follows 1900, which had the smallest sun-spot frequency 

 of the whole 11 years. According to Table Til. the close parallelism 



