22 



ON THE RECENT SECULAR PERIOD 



Auroras according to Classes, from 1827 to 1848, inclusive. 



Auroras of the separate Months, from 1832 to 1848, inclusive. 

 [From the Regents' Report.] 



Remarks. 



1. The average, per annum, for the entire period, is nearly 46. 



2. The greatest number for any single year, was in 1840 — being 75. 



3. Average for the spring months, 73s ; autumnal months, 70s; summer months, 

 G4 5 ; winter months, 501. The six months on the side of the perihelion (Octoher, 

 November, December, January, February, March), 57*; on the side of the aphelion, 



