162 W.R. Dawes on the Telescopic Appearances of Saturn. 
“Noy. 26. Only a very narrow line of shadow from the ball 
falls on the west side, but there is a curious atigular projection in 
the shadow on both the west and east sides of the apex of the 
ball.” 
‘Dec. 7. The annexed sketch shows the form of the shadow 
ey ET rag naa 
B Bali 
of the bail upon we = ” (Exaggerated in the sketch as respects _ 
the size of the sha 
6. The Satellites. pe have usually estimated Tethys to be 
brighter than one, even when it has been nearer to the pres 
4, 
M. T., when both the satellites were 
near their Hectiey western elonga- 
tion. At Lith 19™ G.M.T., Dione, ; 
Tethys, and Enceladus, formed an 
eater Shes sonth-preceding 
of the ring, thus,— 
In No. 929 of the Astron. Nachrichten, is a most interesting 
account by Professor Secchi of the appearance of Suturn in the 
Manich equatorial refractor, recently erected at the we 
at Rome. The dimensions of the telescope are the same 
those of the Dorpat refractor, the aperture of the chee 
being 9 Paris inches. The Professor characterizes the night of 
Nov. 19 as one of extraordinary excellence, and doing full justice 
<i 10 thie telescope. He describes the dark line on ring A as being 
~ just like a pencil line drawn Upon it, which perfectly agrees with 
the views I have had of it since IS5L: and with my description 
as “narrow, very dark, but not black. *” And when the dusky 
hue of the ring A is considered, t seems probable that this line 
would appear almost black if congoneéa with a much brighter 
ground, such, ae instance, as the exterior edge of the ring B. It 
> marked that a dark Sigs precisely similar to this 
in appearance rea situation, was seen on the northern surface 
this ring, in the year 1838, by pote Bnet and by Mr. Las- 
sell and myself in 1842 (when we were not aware of —— 
o thts It may not be a division in the ring, as 1 
i supposed to be; but, if it is not, it is cucrahiessaselaa 
that precisely the same appearance should exist on both surfaces 
of the ring, aud should be, as it would seem, a secon a8 
pr grgred respect of its situation on the ring, and icine 
* 
e 
