Chemistry and Physics. 269 
expansions and contractions of the atom itself, This again is opposed to 
the ordinary idea that the atom is essentially solid and impenetrable. 
rs the modern idea, that matter consists of a force of resistance 
acting from a centre.—Phil. Mag., [4], xxvii, 346, May, 1864. 
11. On Periodic Changes in the Magnetic Condition of the Earth, and 
“ “sn Distribution of Temperature on its Surface; by Mr. BaxenDELL, 
A 
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follows, the unit of value being one division of the scale of the magnet- 
Ometer, or 26°3" of are: 
. from Diff. from 
general general 
| ___mean, mean. 
Day. pts. Day. pts. 
1 - $18 9 —. 7:86 
Ce = BOR 10 - 799 
8 - 3°32 1 = 010 
4 + +18 12 + 45 
5 - 480 18 + 14°83 
6 - 021 14 + 9-22 
7 - 1659 + 119 
8 -~ 666 16 + 5:99 
_ A projection of these numbers shows that, of the seventeen consecutive 
12 
days, 
e 
478 per day, the mean for the year being 39°86. The ratios of the 
sol of minimum, to the mean value, are therefore as 1 to 10-09, and as 
* to 834, 
