56 Lovering and Bond on Magnetic Observations at Cambridge. 
At 1" 25’ A. M., Gott. M. T., the reading of the scale was 111.9 
Range of 52/.4 East in 1" 10’. 
ce Qh 35! cc cc 79 “ ce 164.3 
Range of 52/.9 West in 1 hour. 
(74 gh 35! ce (74 it4 ce ce 111.4 
Again, at 5" 20’ A. M., Gott. M. T., the reading of the scale was 108.5 
Range of 47’.6 East in 25 minutes. 
“ a Ta “ “cc « 156.1 
Range of 52’.4 West in 1 hour. 
{4 6" 45! (<4 ce (74 “ec ce 103.7 
During the first of these periods, the Aurora reached its culmina- 
tion of splendor; between 5" and 7" it was faint and near the 
horizon. It does not appear from an examination of the May or 
August Term-day that the maximum agitation of the Magnetometer 
coincides in time with the greatest brilliancy of the heavens. In 
May, it had not accumulated its action when the Aurora began to de- 
cline ; and in August, although it accompanied the display it con- 
tinued with undiminished energy one or two hours after that had 
passed away. The most rapid motion of the bar was from 5° 
20’ to 5" 45’, being equal to 476. in 25 minutes. This is nothing 
strange ; but might be expected from the time which all the forces 
of nature consume in communicating themselves to bodies and 
penetrating large masses so as to overcome their inertia. More 
exact and frequent observations will doubtless conduct to a better 
knowledge of a connexion which is now so undeniable and yet so 
imperfectly understood. If observers are careful to note the times 
at which the chief phases of the Aurora are witnessed and its posi- 
tion among the stars and, where they have the opportunity, the si- 
multaneous variations of the Magnetometer we may not despair of 
elucidating these two classes of intricate and interlaced facts; the 
