Natural Philosophy. -—'Acoustics, — Mag netism. 1 8S 
Months. 
Barometer 
in Inches. 
Thermome- 
ter, Fabr. 
Hygrome- 
ter, dry. 
Velocity of 
Sound in a 
Second in 
Feet. 
January, 
30.124 
79°.05 
6°. 2 
1101 
February, 
30.126 
78 .84 
14.70 
1117 
March, 
30.072 
82 .30 
15 .22 
1139 
April, 
30.031 
85 ,79 
17.23 
1145 
May, 
29.892 
88 .11 
19 .92 
1151 
June, 
29.907 
87 .10 
24 .77 
1157 
July, 
29.914 
86 .65 
27 .85 
1164 
August, 
29.931 
85 .02 
21 .54 
1163 
September, 
29.963 
84 .49 
18 ,97 
1152 
October, 
30.058 
84 .33 
18 .23 
1128 
November, 
30.1 25 
81 .35 
8 .18 
1101 
December, 
30.087 
79 .37 
1 ,43 
1099 
Mr Goldingham concludes, that for each degree of the ther- 
mometer 1.2 feet may be allowed in the velocity of sound for a 
second; for each degree of the hygrometer 1.4 feet; and for 
^\th of an inch of the barometer 9-2 feet. He concludes that 
10 feet per second is the difference of the velocity of sound be- 
tween a calm and in a moderate breeze, and 21 J feet in a second, 
or 1275 in a minute, is the difference, when the wind is in the 
direction of the motion of sound, or opposed to it. — See Phil. 
Trans. 1822, p. 96-140, and pp. 177, 178. of this Number. 
MAGNETISM. 
8. Magnetism qf Titanium., Colalt arid Nichel . — Dr Wol- 
laston having formerly been of opinion, (see this Journal, vol. ix. 
p. 403.), that the entire crystals of Titanium were not attract- 
able by the Magnet when they were freed from adhering par- 
ticles of iron, had occasion to re-examine them, and found this 
opinion incorrect. Although the crystals are, in this state, not 
sufficiently attractible to be wholly supported by the magnet; 
yet, when a crystal is supported by a fine thread, the force of 
a,ttraction is sufficient to draw it about 20® from the perpendi- 
.cular, and, consequently, the force of attraction is equal to 
about one-third the weight of the metal. A cubic piece of soft 
iron, of the same size, and weighing half a- grain, had its attrac- 
tive force to the same magnet such that it was able to lift from 80 
to 90 times its weight of a silver chain. Cobalt carried from 50 
•to 60 times its weight ; and Nickel from 20 to SO times its own 
weight. Dr Wollaston considers that the presence of gj^th 
