904 AN ACCOUNT OF THE 
tunity, the circle will be taken up to Kedar Kdnia and Uchalaré. The 
former is 12,589 and the second 14,142 feet higher than the sea. 
3, A REFLECTING circle made by Troucuton and marked No. 44. I 
did not receive this particular instrument from Mr. Trouauron himself, but 
purchased it in Calcutta; though substantial and perfect in all respects, 
it does not appear to me, to have so high a finish as the more modern cir- 
cles of this construction made by that excellent artist, and though it is 
rather larger, I suspect it may be somewhat inferior to them. Every 
person conversant with reflecting instruments, knows the advantage which 
circles have above sextanis, and it is needless to mention it here. When 
the altitudes of stars were observed, we always took them, om different 
nights, on alternate arches of the circle, and the sun in the same manner: 
the pole star only can be observed on both arches on the same night: some 
times indeed when a star could not be taken on both faces, the index error 
was used, but always with reluctance. ‘When the weather allowed of it, 
the stars were taken north and south of the zenith, as equally, as to number 
and altitude, as circumstances allowed. It will be seen by the lists, that 
the observations for latitude have been very numerous. ‘T'ney were taken 
with great care: no glass roof was used over the mercury, when it was pos- | 
sible to dispense with it: the closest corrections for precession, aberration, 
nutation, and for refraction, according to the state of the atmosphere, were 
applied to the altitudes, which were faithfully noted. With regard to re- 
fraction, the quantities directed by the tables corrected for the barometer 
and thermometer were applied, but as it is not impossible that there may be 
"peculiarities in the atmosphere on lofty mountains, which the usual rules will 
