Natural Philosophy, — 'Astronomy. 175 
ture;, a half sheet will be published, to avoid delay. Twenty^ 
four numbers will make a volume, for which a title and index 
will be given. The articles in the first number are by Professor 
Posselt of Jena, Professor Nicolai of Manheim, Dr Olbers of 
Bremen, and the Chevalier Burg at Copenhagen. 
3. Astronomical Observations made at Bushey Heathy Stan^ 
more , — • ^ 
42 25 mean time at Bushey. 
43 45 mean time at Greenwich. 
Latitude 51° 5V 44/'.3 North ; Longitude West in time, 1' 2(y\93. 
1821, ^ , ,, 
Aug’. 4. Immersion of Jupiter’s > 11 04 31 mean time at Bushey. 
second satellite, j 11 05 25 mean time at Greenwich 
Aug. 11. Immersion of Jupiter’s 1 13 
second satellite, j 13 
Aug. 11. Occultation of ) Immers. 8 
K Aquarius, j Emers. 9 
Sept. 11. Transit of Jupiter’s first ) 10 
satellite, f 10 
Sept. 11. Emersion of Jupiter’s ) 10 
third satellite, j 10 
mean time at Bushey. 
48 1T.8 > 
39 16 j 
23 29 mean time at Bushey. 
24 50 mean time at Greenwdeh, 
30 12 mean time at Bushey. 
31 33 mean time at Greenwich. 
The immersion of a Aquarius was instantaneous, and the time 
certain to a second. Dew having rendered the object-glass of 
the telescope somewhat obscure, the emersion was not so accu- 
rately determined. The appearance of the star, when in con- 
tact with the moon, renders the idea of a lunar atmosphere very 
improbable. 
METEOROLOGY. 
4. Remarhahle Aurora seen at Belleville^ Inverness-shire, in a 
Thunder Storm. — On the evening of the 23d August, about half- 
past nine o’clock P. M. when there was not a breath of wind, and 
when the thermometer stood at 63°, the noise of very distant thun- 
der was heard towards the south. Sheets of very brilliant light- 
ning illuminated the sky, issuing, in general, from a small black 
cloud near the horizon. I was surprised, however, to observe, 
that, with the exception of a few thin black clouds, which were 
rendered visible by the lightning, the greater part of the sky 
was covered with shining masses, like those which form the 
aurora borealis. The stars were easily seen through this lumi- 
nous matter, which was arranged in irregular masses, separated 
by clear intervals, but having a tendency to assume the appear- 
ance of irradiations, diverging from the cloud whence the light- 
ning appeared to issue. When the lightning flashed, it was pro- 
pagated in a particular manner along these masses of light ; but 
