‘ae ae 
Mar. Newenham of Cork informed me by letter that he faw it 
on the eaftern fide to the sth, when at 10H. 30° he loft fight 
of it. This obfervation he made with a refleiing telefcope of 
feven feet focus, and power 300. 
Tue power I ufed was fuperior to this; but the tranfit inftru- 
ment being fixed, is badly fuited to this kind of obfervation, as 
the planet paffles the field with great rapidity, and with this 
inftrument one cannot purfue it; which is a circumftance effen- 
tially neceffary to diftina vifion, as I formerly mentioned to this 
Academy in a paper publifhed in the firft volume of our 
‘TranfaCiions. 
Tue obfervations which I have made are hitherto fo badly 
circumftanced, that any dedué€tion from them with refpe@ to 
the tables, &c. would be trifling, until the next reappear- 
ance, which may either invalidate or fortify fuch as have been: 
mentioned. 
Ir is, however, worthy of remark at prefent, that Saturn now 
divefted of his ring appears exceedingly oblate; much more fo 
than I could have ever fuppofed from common obfervation whilft 
his ring was vifible: and as his rotation has not, that I know of, 
been yet determined by any fpots vifible upon his furface, it — 
occurred to me that if his equatorial and polar diameters were 
accurately meafured, I could infer his'time of rotation by means 
of the 19th Propofition of Book III. of Newton’s Principles, by 
a deduCtion from the formula which he there employed, to find 
the 
