Double Stars.— Nebula?. 277 



ting curve of more or less regularity. We snail, therefore, 

 expect to find that the maximum will be retarded beyond this 

 epoch, though it may probably fall within the month. If the 

 acceleration has reached its limit for the present, it will take 

 place about May 27 or 28; but in the existing absence of more 

 reliable data, it should be watched from the 7th to the end of 

 May. 



The present may be an appropriate place for introducing 

 the mention of two Red Stars not included in Dr. Schjellerup's 

 catalogue of those objects, in No. 1591 of the Astronomische 

 Nachrichten, or in the list given in our number for Sept. last. 

 Mr. Lassell states, in the Monthly Notices, xvii., 65, that on 

 Sept. 5, 1857, while sweeping about Cygnus, with his 2f. 

 mirror, and admiring, with power 160, the wonderful richness 

 and splendour of the milky way, he discovered what appeared 

 to him the deepest red star he had ever seen, 9| mag. R. A. 

 xxih. 16-6m., N.P.D. 48° 13' : while inR.A.xxih.37m., N.P.D. 

 52° 42' is another deep-red star, rather brighter, 8 mag. 



DOUELE STARS. 



The acquaintance we have made with v Hydro?, will enable 

 us by his means to fish out two objects in the same neighbour- 

 hood, which, though telescopic, being easily found, may be 

 admitted into our long discontinued list of Double Stars. 

 Resuming our former arrangement, the first will stand as 



158. P. x. 159 Hydros, 31"5. 10°. 8, 9. Pale white and 

 light blue; less than 1° n p v Hydro?. This pair, though 

 pretty, points, nearly, to a much finer object, about 22' n ; 



159. 2 1474 Hydro? ; a beautiful triple group, of which the 

 data, according to S, are: A. 6*9, B. 8, C. 7*7 mag. — A.B. 

 71 ,, 67, 22°22.— C.B. 6"38, 196°14.— Yery white. 



NEBULiE. 



In our number for last November, mention was made of 

 certain nebulas to which a suspicion was attached of variable 

 light. In Riimker's Hamburg Catalogue of Circumsolar Ne- 

 bula?, recently completed, two more instances occur, which 

 may with propriety be included in our list of these objects ; 

 since, having beeu observed with only a 5f. telescope, they 

 are within the reach of a large proportion ,of astronomical 

 students. The first is (resuming our own numbering) : — 



33. Gen. Cat. 4351. R.A. xviih. 50m. 54s., D.N. 70° 

 10' 48". Of this, which was discovered by Auwers 1854, 

 July 24, and considered by him pretty faint, Rumker made 

 four observations, 1866, Oct. 5, 6, 7, 11 ; in the three first of 

 which it is expressly called " bright," or " very bright." It 



