OF ARTS AND SCIENCES. 325 



Mr. Bond communicated the results of some recent observa- 

 tions on the planet Jupiter, and on the nebulae Herschel Nos. 

 1357 and 1376 and the great nebula of Orion, as follows : — 



" On the 28th of January and 3d of February, we had excellent op- 

 portunities for examining both hemispheres of the planet Jupiter, as on 

 both occasions the atmosphere was in a remarkably tranquil state, and 

 the definition good. 



" On the 28th of January, at 10''' 30"'- Camb. m. s. t., nine belts were 

 counted, including those covering the polar regions of the planet. 

 The principal equatorial belt was of an even surface, and its edges were 

 nearly parallel. The next north was very irregular, particularly on 

 its northern side. The other belts bore a striking resemblance to cirrus 

 clouds, when about subsiding into the elongated form of cirrostratus. 

 At the same time, the shadows of two of the satellites, the first and third, 

 were seen transiting the disk. The preceding of these shadows when 

 drawing near the limb became less intensely black, and was elongated 

 in a direction nearly parallel to the axis of rotation of Jupiter. The 

 third satellite was seen at the same time on the disk, as a black spot, 

 and was then taken for the shadow of another satellite. It was not 

 until we had compared its place with the ephemeris given in the Nau- 

 tical Almanac, that we became satisfied that it could not have been a 

 shadow. It agreed, however, with the computed position of the third 

 satellite. Early in the evening, the first and third satellites were ob- 

 served approaching the primary on the following side. The first ap- 

 peared to be the smallest. The ingress of the third was observed, and 

 when about half on the disk, it looked like a mountain projection on 

 the limb of Jupiter. Neither of the satellites, when entirely on the 

 disk, was visible at that time. Further observation was interrupted 

 until about the time of ingress of the shadow of the third satellite, the 

 first internal contact of which was noted at G*"- 41™' 5P- sidereal time 

 at the Observatory, the definition being at the time exceedingly fine. 

 We now saw three black spots. The preceding was the shadow of 

 the first satellite, which was now off the disk ; the next occupied the 

 position of the third satellite ; the last, near the following limb, was the 

 shadow of the third satellite, very black, and larger than the satellite 

 itself in the proportion of 5 to 3. 



" On the 3d of February, at 9''- 30"- m. s. t., the opposite hemisphere 

 was presented under equally favorable circumstances. Three belts 



