a 
1815.] 4 Magnetical Observations. 379 
Comparison of Observations. 
eat at neperta aes 
| 1813. 1814, | * 1815, 
Morning ........) 24° 09 18” | 24° 19’ 53” | 40 16! Or. 
April...... Nopnicchen bes ape |. oer Shy. 12 24 23 53 24 27 42 
Evening.......... | 24 15 ‘25 24 15 30 24 17 | 48 
Morning ....... . 24 12 02 | 24 13 12 | 94°16 32 
May ...... : Nopoiecnds ys ilist | 24 20 54 24 22 18 24. 27 .08 
; Evening. ......... | 24 13 4T 24 i6 44 24 19 12 
NCO | 24°12" 35 le Pal es 1) 24 16 Ii 
June... DMUOIT "Peds, 'e'0 08s ) 24 22° 17 24 22 48 24 97 #18 
Evening ........ | g4 16 04 24 16 29 24 19 40 
Morning .....00.| 24; 14. 32 24.13 29 24, 15. 5k 
POLY salts x4 NOON. noo acis/ois.c as 24 23 04 24 23 44 24 25 45 
Evening.:..:.....|' 24 "16 43 24 17 00 24 19 492 
Morning ......2., 24 15,53 24 14 13 24 16 Ol 
Anesth, 1. 5< NOON). . 0... ->j<02,- 24 223 32 24 23 48 24 24 07 ., 
Evening.......... 24 16 08 24 16 31 24 18 292 
Morning ........| 24 15 46 24 14 33 24 15 58 
September.< Noon............ 24) 22) 32 1) > 24, 935.17 24. 83 Ol 
Eyening.'......... | 24 16 04 24 16 50 24 17 25 
eee ee nr rene ees 
In deducing the mean, the observation‘on the noon of the 30th 
and 26th, and the cbservations on the evening of the 27th, 28th, 
29th, and 30th, are rejected. On Sept. 26, rain fell. On the 27th, 
hard rain, with thunder and strong wind. Sept. 29, the sky was 
very black in the west, and hard rain fell afterwards, Sept. 30, 
rain. 
ber ot Between noon of the Ist Sept.2 ,, ice! 
Rain fallen Tree noon of the Ist Oct. ‘ 1100 inch, 
Evaporation during the same period .......... 2-600 
ArticLe VIII. 
Some Remarks on the Theory of the Equilikyium of Radiant Heat, 
and on some Difficulties started against that Theory. By M. P, 
Prevost, Professor of Philosophy at Geneva. * 
I. In the Annals of Philosophy for May, 1815, vol. v. p. 338, 
there is a very good refutation of some objections to the theory of 
the equilibrium of radiant heat. ‘Thé objections mentioned by the 
author of that memoir (Mr. Richard Davenport) are three in 
number, 
The first, extracted from the new Edinburgh Encyclopedia, is 
announced in these ierms : “ On this hypothesis a hot body ought to 
cool more slowly when it is placed near a large body of inferior 
* Ii may be proper tostate, that this paper was drawn up by the author in the 
French language, and that 1 bave translated it into English,—T, 
