Dar eae 
its greatest extent “ unfathomable by the t 
ees copes 
mentioned either by Melchoir 
140 Scientific Intelligence. 
erfect and in bad nights, the part of it which 
beforethe mirror was. 
( appearance described by Sir ohn Her« 
ongst which these are scattered. . Having seen them end [known the 
er parts, they were seen with the 3-feet and 500. * *. fn. 
other interesting object is the planetary nebula, h. 464, bie the 
splendid cluster, Messier 46, and probably a part of it. It is a dise of 
small stars uniformly distributed, and surrounded by the larger. Mes- 
ster 64 isa singular modifegtion of the annular form seen obliqu ly. 
‘The € opening seems black as ink, and at its oS is one of those in- 
terior clusters of bright stars’so often noticed be: "But the most re+ 
markable nebular arrangement which this seectinngey Beret hee a 
that where the stars are grouped i in spirals. Lord Rosse 
of them (Messier 51) in the year 1845; arid Dr. “Robinson found fo 
others on the 11th, of which he ex xhibited drawings, h. 604 (seen by 
— as a biscentral nebula), Messier 99, in which: the’centre is’ 
Stars. Messier 97 looks with the finding eye ea fig: 
we *@;"bus the higher powers show star-spirals— ‘iolatat 
appearing like ‘stars with dark spaces around them —though "probably 
| powers’ in a fine night would prove “then to be clu Another 
fact deserves to be noted frorit its bearing on. Struve’s Etudes @ Astro- 
nomie Stellaire. In that admirable book, reg other curious ae 
he infers that the eighteen-inch telescope'of H erschel | 
space only one-third of what was due to its optical al power. Tio 
plains this by supposing thé heave hy ee 
In computing the’ limit, however, he assumes that the My Way js in 
} 
. 
d'to observe it when it is deepest at d is. certhin' thet its 
remotest stars were very far indeed within the limit of the  sneeot, and 
yes rig larger than those of the nebula of Ori 
2. Planet, (Lond. Athenaut, May 6; re co new planet 
desea aed by Mr. Graham, at hendccke, rela Sagi 25, 1848: 
It appeared like’a star of the tenth Ce Nee ; am, 8: decli- 
8. Supposed new Star, (ibid.)—A new star of the fif hua + 
the ecieanaithciol? Ophiuchus, ad ~~ at Mr. Bishop’s € ratory, 
idon, April 28, 1848. No has been ans recorded in the 
" position of ‘this. ° Iris in a lin iting ‘éta and 2 iuchi, rather 
0 Oph 
nearer to the latter; RvA. Is. 9. decl. 12° 39’. igen 
degrees distant | from the ani ne the famous ‘object seen by Kepler 
in 1604. 
4. On the ice of Copernicus with respect to the Light dee ie 
Planets ; by Prof: De Morcan, (Phil. Mag., xxxi, p. 528.)—The 
mon story is, that — cB on being opposed by the rayon th 
Mercury and Venus did ph om tinewered that the Pe 
would be discovered atinie ¢ me "the fi rst place in whieh I 
story is in Keill’s Lggtures. © It is also’ given by Dr. Smith, hed ova 
known Treatise on Optiés, by Bailli, and by iota “But I cannot fi 
Adam or Gassendil intheir bids 
