C Si8 ] 
I flioiild have loft four good days obfervations, which were 
two-thirds of thofe I took on this fide of the hill with the 
plane of the inftrument turned to the Weft, and been re- 
tarded near three weeks in my obfervations ; and, as the 
opportunities of weather fit for obferving at all were but 
very rare, I might have been thereby thrown back into 
the winter, and defeated of making fo complete a fet of 
obfervations on the North fide of the hill as I had got 
on the South fide, whofe correfpondence would thereby 
have been rendered lefs perfedt. I had the fatisfadtion, 
however, when I drew the meridian line on the floor of 
the obfervatory by the equal altitudes of the Sun tak i 
on the 15 th, to find it agree perfedtly, even to the fame 
minute, with the pofition of the inftrument, as deter- 
mined by the tranfits of the ftars. But no one will doubt 
of the fuperior eafe and readinefs afforded by the latter 
method, in preference to the other. 
On the 20 th of September I compleated the obferva- 
tions with the plane of the fedlor turned to the Weft, 
having obferved 3 2 ftars, and taken 6 8 obfervations in 
* all. On the 2 2d, I turned it about with the plane to face 
the Eaft, and fet it again in the meridian, by putting it 
parallel to its former pofition, by means of the meridian 
line fecured by marks made on picquets let into the 
ground perpendicularly below the plane of the inftrument, 
before it was turned. Between this time and the 24th of 
O(ftober, I obferved 37 ftars, and took 100 obfervations 
in all, with the plane of the inftrument facing the eaft : 
and 
