152 Lovering on Magnetic Observations at Cambridge. 
is visible in the observations on the other. The Term-day ob- 
servations in this volume bear testimony, therefore, to the mani- 
festation of simultaneous disturbances on the two continents; and 
from the volume of ‘Observations on Days of unusual Distur- 
bance,’ we know that this simultaneity extends to stations much 
more remote from each other than Europe and America. In re- 
viewing this result, we must combine with it the no less certain 
conclusion, derived from the discussion to which the disturbances 
occurring at the regular observation hours at Toronto have been 
subjected, that these interesting and remarkable phenomena 
exhibit at Toronto a systematic action connected with, and ap- 
parently having relation to, the hours of the day.” 
The period embraced in this communication has been deficient, 
it would seem, in that most beautiful of all meteoric phenomena, 
the Aurora. Several feeble manifestations of it are recorded, but 
only on one occasion did it assume its usual brilliancy in this 
latitude. This was on the 18th of November, 1841, when extra 
observations were made on the disturbed magnetometers. The 
Toronto observations show that a similar derangement, accompa- 
nied with a brilliant Aurora, occurred on the same day at that 
place. On the 15th of January, 1842, the same coincidence is 
noticed at Cambridge between the appearance of this mysterious 
visitant and the derangement of the earth’s magnetic axis. It is 
satisfactory to find this additional confirmation to that law of de- 
pendence between the two phenomena, which has forced itself 
on the minds of meteorologists, however difficult or impossible 
even it has been for them to assign its definite character, or 
mould it to any precise mathematical expression. If facts are 
better than unaided speculation, and if induction is still the true 
method of our philosophy, we may promise ourselves that a rich 
harvest will come from the diligence and fidelity which are now 
