General Physics. 137 
65. Recent Progress of Magnetical and Meteorological Science,— 
being notices of several new publications both American and Foreign 
on these subjects. 
(1.) Observations made at the Magnetical and Meteorological Obser- 
vatory at Toronto in Canada, 1840, 1841, and 1842. 4to. 
We are beginning to reap the fruits of the grand system of mag- 
netical and meteorological observations which was commenced in 1840. 
Several volumes of observations have already appeared, and we shall 
look for others in due time. Above we have given the title of a thick 
quarto volume, containing at large the observations of three years at 
Toronto. It is a splendid volume, and will prove a lasting monument 
of the liberality of the British government. 
The Toronto Observatory is situated in latitude 43° 39’ 35” N., lon- 
gitude 79° 21’ 30” W., and is 108 feet above the surface of Lake Onta- 
rio, The main observatory has two apartments—one 50 feet by 20 
for the instruments, the other 18 feet 12 for a computing room. The 
observatory was provided with instruments for measuring the declina- 
tion and inclination of the magnetic needle, the horizontal and vertical 
force, and also with a complete set of meteorological instruments. We 
regret that we can only find room for a few of the results of these ob- 
servations. 
The mean declination of the needle for 1841, was 1° 1435 west. 
$f 842, 1° 1895 
Annual increase of west declination, 4’°6. 
The mean inclination of the needle for 1841, was 75° 17'-0 
“cc 6c 1 ® “ce vs 16°°4 
The resulis for the two years are so nearly identical, as to prove 
that the annual change of inclination must be exceedingly small, and 
even to leave it uncertain in what direction this change is taking place. 
The magnetic observations on the term days are all projected in 
curves; and side by side are placed for comparison the curves at Bos- 
ton and Philadelphia. The correspondence in the motions of the nee- 
dle at these three places was generally quite remarkable ; all the larger 
movements at either station, and frequently also the most minute ones, 
being exactly copied at each of the other stations. S 
he mean temperature of 1841, was. A 43°°9 
se # —" . 44°83 
The greatest heat of the two years, was = 91°°7 
The greatest cold ‘“ $3 . —5°2 
Range of the thermometer, 2 : 96°°9 
The maximum of the barometer, was Z 30°417 
The minimum ‘“ s * 28°672. 
Range in two years, . ; ° ‘ 1745 
Secoyp Serres, Vol. I, No. 1.—Jan. 1846. 18 
