Kæmtz’s table.
A table by Kæmtz, showing the number of Auroras in each month of the year, with the maxima and minima as above stated, will be found on Plate V. fig. 5.
Dr. Hayes’s observations in winter of 1860-61.
Dr. Hayes has observed that in the winter of 1860-61 (when the ten or eleven years’ inequality was at its maximum) only three Auroræ were seen and recorded, and they were feeble and short in duration.
Captain Maguire’s observations at Point Barrow as to number and time of appearances.
Captain Maguire, at Point Barrow (1852-54), reports that the Aurora was seen six days out of seven, and on 1079 occasions, being nearly one third of the hourly observations. It was seldom seen between 9 A.M. and 5 P.M., not at all between 10 A.M. and 4 P.M. It increased regularly and rapidly from 5 P.M. until 1 A.M., and then diminished in the same way until 9 A.M.
The winters of 1877 and 1878 and the springs of 1878 and 1879 have been singularly deficient in Auroræ. I have seen none at Guildown.
Duration of Aurora.
Duration of Aurora. Sometimes a few minutes; at other times the whole night or even days.