412 Dr. B. Stewart. [Mar. 9, 



Table I. — Exhibiting the method of forming a series of Fluctuations 

 of Temperature- Range. 



Col. 1. 



Date. 

 1872. 



Col. 2. 

 Sums of 

 ranges 

 F + K + S. 



Col. 3. 

 Sums of 

 4 values 

 of Col. 2. 



Col. 4. 

 IVteans of 

 25 values 

 of Col. 3. 



■ 



Col. 5. 



Differences, 

 Col. 3, Col. 4. 





244 











2 



185 



963 









3 



263 



1028 







55 



4 



271 



1082 







5? 





309 



1040 







55 



Q 



239 



984 







55 





221 



908 







55 



o 



215 



958 







55 



9 



233 



1089 







" 



J-\J .... 



289 



1154 







55 



11. . 



352 



1200 







55 



12 



280 



1158 







55 



13 



279 



1110 







5> 



14 



247 



1091 



993 



+ 98 



55 



15 



304 



1131 



986 



+ 145 





16 



261 



1132 



975 



+ 157 



55 



17 



319 



1110 



963 



+ 147 



55 



18 



248 



1038 







55 



19 



282 



981 







55 



20. 



189 



944 







55 



21 , 



262 



857 







55 



22 



211 



905 







55 



23 



195 



813 







55 



24 , 



237 



744 







55 



25 



170 



728 







55 



26 



142 



686 









27 



179 



768 







55 



28 



195 



757 







55 



29 



252 



787 







55 



30 



131 









55 



31 



209 









5. The numbers representing the diurnal ranges of decliDation at 

 Kew are derived by means of a measuring instrument applied to the 

 magnetograph curves, and are recorded in decimals of an inch. As 

 the results are merely comparative, decimal points have been omitted. 

 These numbers have been treated in the same way in which the 

 numbers in column 2 of the above table are treated ; in fine, the tem- 

 perature and declination-ranges have had applied to them precisely the 

 same method of treatment. 



Ultimately we obtain, as in the case of the temperature-ranges, a 

 column representing declination fluctuations, and comparable with 

 column 5. 



6. In Table II the temperature-range and declination-range fluctua- 

 tions are exhibited side by side for the various months of the years 

 1871 and 1872. 



