TOt. XL.] PHILOSOPHICAL TRANSACTIONS. I49 



Apparent lime. 

 At Q^ 23™ 37* He first saw Mercury for a few seconds, and judged he was 

 got entirely within the sun's disk, or perhaps a little more ; 

 then clouds again, with some intervals of a few moments 

 between, which allowed a sight of Mercury about 3 or 4 

 several times ; then quite cloudy till near 1 2, when we had 

 a sight of the sun for a few minutes, and took his transit 

 upon the meridian ; at which time we judged Mercury to be 

 about two of his diameters, or a little more, within the sun's 

 disk, and a little past the vertical line. 

 12 10 27 We had again a sight of the sun, but Mercury was gone off. 



2. At the observatory of Bononia, by Sig. Manfredi, F. R. S. P. 103. 



Beginning of Mercury's ingress 22** 7"* 56' 



Ingress of the centre 22 



Total ingress 22 



Beginning of the egress O 



Egress of the centre O 



Total egress O 



The mora of Mercury's centre on the sun's disk 2 



Semimora 1 



Middle time of the transit 23 



3. Extracts of a Letter from Mr, Professor Weidler, F. R. S. &c. to Dr. 

 Mortimer, Seer. R. S. dated at Wittemberg, Jan. 1, 1737, n. s. P. 110. 

 Mercury appeared within the sun's eastern limb, as represented in fig. 17, 

 pi. 5. 



.... at 1 12'' 4™ 30* at 5 



5 abt 2 12 44 20 6 



at 3 12 52 45 7 



j4 Collection of Observations, relating to the Comet which appeared in January, 

 February, and March 1736-7. N° 446, p. 111. 



1. Observations on that Comet made at Oxford, by J. Bradley, F.R.S. P. 1 j 1. 

 Mr. Bradley made several observations on the late comet, during the last 5 

 weeks of its appearance, which enabled him to find out the elements of a para- 

 bolic trajectory, on which a calculus might be founded, that would correspond 

 with each of his observations within about a minute of a degree : but the first of 



