Astronomy. 139 
of “a sieows gored and a eae he clouds of iridescent colors remark- 
in H. rufescens they are remarkably 
It is more. poner ae any Haliotis which we sir e seen, 
vai aeet oz. avoid 
ogical M wag as a Hab. 
findi pegs species in Reeve’s very: comple and hema 
monograph, I have ventured to arene it as new 
IV. ye ae 
- oo Rosse Telescope, (Lond. Aiheteoin, April + Ecas the 
meeting of. su! a in siegelee Academy, March 17, 1848, Dr. 
e an account, present condition of ont Bosse’ 's eee 
‘that fs a whose figure, as he had formerly sta- 
- Was not quite pesfost). as well as a duplicate one, had been polish- 
ed by the workmen; and os - meron ded no difficulty in the pro- 
cess, it was repeated. pected ntaad however occurred, 
ich x much delay, fill Lord Ri Rosse ered the cause. The 
the operati Sage age that. it mt performed at the tempera- 
. In winter this must be obtained by ‘artificial heat,—which 
weer: iner the arynees ot the airyso that the Polishing material 
cannot on the Specul t > the urface is untrue, 
and gives a ortowe image. »Phis was veri i the hygrometer, 
and comp diae, by a jet of steam so regula nf to keep the air satura- 
with moisture. The result ag aa hy trial 
speculum ep ‘well, that rt ‘ 
riments. » additions had "beda made yanenesnry ty aay telescope : 
‘be movement in right ascensionis given from the ground x pc a 
ry intended to be connected with. a clock movement which is in pro- 
2. To obviate the difficulty of finding objects, an eye-piece of 
Jarge field and peculiar construction is connected with a slide, so that it 
can be mpltee’ by the usual one in aninstant. It magnifies 208 times, 
s nearly four feet of the speculum, the same as Herschel’s 
Pefert ; ws giving the poway of trying what that instrument might 
3. 
o 
Pe aaten- -circle attached. "Tight admitted at its edge cannot escape at 
the - paral faces except they be scratched, and a scale of equal 
parts engravec one of them with a diamond—luminous in a field ab- 
black, The exceedingly unfavorable state of the weather sub- 
( qt i eee much from being done ; in fact, there was but one - 
. i ean covered with iragnents and satisfied himself that 
een often discussed, had no visi- 
above the Ms surface. In the belts of Jupiter, streaks 
se 0: fess s. cloud were seen ; and the fading of their brown 
rds the edge, is podesee that ber SP are seen through a for 
| Se a A similar sha ade 
micromete’ is peculiar,—a plate of parallel glass, with , 
Dene, 
Be. 
