[ IO ] 
tamty could arife; and the Wire of which had been 
broken three or four times in the firft Year of my 
Obfervations : I attempted to examine, whether Part 
of the ’forementioifd apparent Motions might not 
have been owing, to the different Plumb-lines that 
had been made ufe of. In order to determine this, 
I adjufted a particular Point of the Arc to the Plumb- 
line, with all the Exactnefs I could 5 and then taking 
off the old Wire, I immediately hung on another, 
with which the fame Spot was again compared. I 
repeated the Experiment three or four times, and 
thereby fully Satisfied myfelf, that no fenfible Error 
could arife from the Ufe of different Plumb-lines ; 
fince the various Adjustments of the fame Point 
agreed with each other, within lefs than half a 
Second. 
Having then, from fuch Trials, Sufficient Reafon 
to conclude, that thefe fecond unexpected Devia- 
tions of the Stars, were not owing to any Imperfection 
of my Inftrumentj after I had fettled the Laws of the 
Aberrations arifing from the Motion of Light, ire. 
I judged it proper to continue my Obfervations of 
the fame Stars j hoping that, by a regular and longer 
Series of them, carried on thro’ feveral Succeeding 
Years, I might, at length, be enabled to difeover 
the real Caufe of fuch apparent 1 neon lift encics. 
As I refided chiefly at Wanfled y after my SeCtor 
was eroded there in the Year 1727. till the Beg in- 
ning of May 1732. when 1 removed from thence to 
Oxford : I had, during my Abode at Wanfted , fre- 
quent Opportunities of repeating my Obfervations j 
and thereby discovered fo many Particulars relating 
to 
