164. FE. Loomis on Solar Spots, Magnetic Declination, ete. 
servations during - interval by one-half, and have combined 
this result with t ew Eng oy beget ca in completing 
the numbers in the “las two colum 
The Boston observations published by Prof. Lovering in the 
Memoirs of the American Academy, vol. ix, p. 101, and copied 
in the Smithsonian Report for 1865, p. 227, extend only to 1848. 
In order to obtain a continuation of this series to the present 
time, I have carefully consulted the Meteorological Journal kept 
_ at Cambridge ence Observatory, and have obtained the fol- 
» lowing results 
Number of Auroras recorded each year at the Cambridge Observatory. 
No No. No Y No. Year. 
teak ee 8 a ar 1950. 16. anes 
ll ot eee eee 1860 12 1866 
; . 
1844 6 1850 15 1856 8 1862 0 1868 
1 
1846 15 1852 tt 1858 30 1864 a 
hen auroras were recorded at New Haven which were not 
recorded at Cambridge, I have added them to the preceding num 
bers, and the result is given in column third of the table on 
page 163. In the years 1860, | and 2, no record of auroras was 
preserved at New Haven, and to supply this omission I have 
age for Las years si observations made at Middletown, - 
y f John Johnston. The European observations 
piitiliched in i Vieriehiahnacheit close with 1861. I have 
continued the table to the present time by means of the obser- 
vations published each year in Heis Wochenschrift, confining 
myself to such observations as were reported south of lat. 55° 
ven in column fifth have been projected in a 
_ os at the top of the accompanying Plate. This 
an unmistakable resemblance to the curve of the 
oi spots, gre to that of the magnetic declination. To each 
maximum of the two latter curves there corresponds a max- 
imum of the auroral curve, not always simultaneously, but not . 
oe from it more than a single year except in one or two 
insta e following table shows the departures of the 
adored maxima from the maxima of the solar spots. 
Date. Diff. Date. Diff. Date. Diff. 
1750 —1 year. 1787 : year. 1837 +3 years. 
1761 Gs 1804 1848 —1 * 
1769 ~) bs oa #15 ie 1860 ake 
1778 = 
The c BF ccrcnstanse in Ga times of a is still more 
remarkable as is shown in the following ta 
Date. Diff. Date. Diff. Date. 
1744, «4-1 year. 1784 0 1833 
1755°5 +15 * 1798°5 une’n. 1843 
1766 A 1810 0 1856 
1775 0 * 1823 0 1867 
“4, 
