‘ 
and the smaller stars gradually 
the cluster in Hercules be- 
as within a few degrees of 
i sof with 
‘ihe 
torially mounted, of six inches aperture and eight feet focus. The o 
ject-glass is the workmanship o +. Mbory itz of this city, an opti* 
cian of great skill and rising reputation; the flint glass, which is quite 
pure, he obtained from Guinand’s establishment in Paris. I believe 
this. object-glass to be free from aberrations, both spherical and chro- 
matic, saving the secondary spectrum which is present in all achromat- 
ics IN proportion to their apertures; its light is sufficient to shew plain 
under favorable circumstances, the stars called by Capt. Sniythe, in the 
Bedford catalogue, the 16th magnitude, and which he says are only 
caught by occasional glimpses under the most favorable circumstances 
by his instrument. It renders the companion of & Lyrz, and the fifth 
Star in the trapezium of Orion, visible. under sufficient illumination for 
micrometric measurement; its defying power enables me to see the 
eae 
_ Tagged cliffs and voleanic chasms of the moon most-beautifully ; it hy 
Sshewn me at one ‘time last winter, the disk of Jupiter covered w 
small belts, in addition to the two usually soc, while two of his satel- 
i planet’s disk, followed by 
their shadows, which were as distinct as black wafers upon white pa- 
tone from the planet ; 
3. New Comet.—Dr. Petersen, of Altona, discovered a new telescopic 
comet on the 7th of August, 1848. fi 
4. Elements of the orbit of the Planet Hebe, (Comptes Rendus Acad. 
Sci., July 10, 1848.) —M. Yvon Villarceau, from a discussion of all the 
ac rgemael he could procure, has deduced the following elements of 
lobe. 
