150 = Lovering on Magnetic Observations at Cambridge. 
bridge in the same examination, but our observations for that year 
are too defective. The observations which are now published will 
furnish ample materials for this purpose, whenever the extra obser- 
vations, made at the other stations in 1842, shall be published. 
Although I have not thought it advisable to bring the short time at 
the close of 1841, during which we had observations at Cambridge, 
into a public comparison with Mr. Sabine’s Table, for fear of antici- 
pating a more satisfactory examination of this question hereafter, I 
have privately done so, and will simply state, that October 26 seems 
to bear the traces of that disturbance which prevailed at Prague, Van 
Diemen’s Land, St. Helena, and Toronto, on October 24, 25, and 
26, accompanied at the latter place by the Aurora; that November 
18 and 19, which were marked at all these other places by great 
disturbances and by the Aurora also at Toronto, are noted at 
Cambridge for the Aurora and extraordinary magnetic perturbations; 
and that December 3, 8, and 30, are remarkable with us, as 
they also appear by Mr. Sabine’s Table to have been at two or 
more of the four other Observatories. It is particularly matter of 
regret that no observations were made at Cambridge on the 
twenty-fifth and twenty-sixth of September, 1841, that. we might 
have seen whether the disturbing energy which swept for several 
days so large a portion of the globe, and which was felt at 
Toronto, Greenwich, Prague, Cape of Good Hope, St. Helena, 
Trevandrum, in India, Van Diemen’s Land, and possibly at the 
Bay of Islands, in New Zealand, extended to our own latitude 
and longitude. 
We have just had the pleasure of receiving, as a present from 
the British Government, a beautiful volume, containing the regular 
observations made at Toronto during the first magnetic campaign 
of 1840-1842 inclusive. This was the period originally comprised 
in the grand magnetic confederation. Three years, constituting the 
