128 
Mr. Schroeter’s new Observations 
again at the southern point , as at a, fig. 4, entered westward a little 
further into the point; and it sometimes appeared as if the sha- 
dow would penetrate all the way through, and entirely cut off 
the point ; moreover the northern horn was not quite so much 
rounded as the evening before. With both magnifying powers 
I saw likewise again, on the illuminated part, a very faint ob- 
long nebulosity b, distant only about ^ of the semidiameter from 
the external edge. For greater certainty I applied a power of 
288 and 370, with which I distinguished the abovementioned 
form of the illuminated part, extraordinarily fine and distinct ; 
I could likewise see, with all the magnifying powers, the 
darker indentation of shadow a, but not the very slight nebu- 
losity b. The indentation of shadow was in length at least ~ 
of the semidiameter; and at 6 h n' it began to pass quite 
through, so that the southern horn appeared rounded like the 
northern, and the fine point, being now separated, looked like 
a glimmering dot of light close to it. I saw this separate point 
of light repeatedly, with 209 times, among other magnifying 
powers, very plain and evident, the image being soft ; in dif- 
ferent observations I found it always the same, whatever was 
the power ; and at 6 h 19' the southern end appeared fully as 
round as the northern. I thought it remarkable, that at 6 h 25", 
a power of 288 shewed it smaller than it appeared with a less 
power. At 7 h 12' the point of light had vanished, as I per- 
ceived with both the 7 and 13-feet Schraderian reflectors. 
Mr. Tischbein, the instrument-maker, who came in toward 
the end of the observation, saw it in the same manner. Both 
horns at this time appeared quite equally rounded ; but a new 
remarkable circumstance was now first discovered by Mr. 
Tischbein. He observed with both reflectors, that at the 
