ue 
Observations of « Aquile. 
The equations resulting from the observations of this star do not 
give the value of 2 nearly exact. The equations resulting from 395 
observations made in 154 days, are 
1. 395e€+58,432—7,77p—63,212—21,28=0 
2. 58,43e+64,99252 + 18,9586p—15,18382—85,4772=0 
3. -7,77e+18,9386xr + 40,9277 p—14, 39212z—74,0507 =0 
4, —63,2le—15,18338~—14,3921p + 184,8813z—132,5715=0 
These give 
z= +0",9643 
p= +1,7311 
z= +0,9438 
e= +0,1027 
It is evident, from this value of z, that some irregularity from 
an unknown source has taken place. 
The five stars, that have been before examined, are all, with the 
exception of Arcturus, within a few degrees of the zenith; and any 
irregularity of refraction, that may have existed, cannot be supposed 
to have affected the results deduced from so many observations. 
The zenith distance of « Aquile being 45° the observations may 
be supposed to have been affected by the irregularities of refraction, 
which there is reason to suppose become, so far from the zenith, con- 
siderable in respect to the small quantities which are the objects of 
our research. However, it might also be supposed these effects 
would disappear in the results deduced from so many observations ; 
but it is to be considered, that fowr unknown quantities are to be 
found from these observations. 
VOL. XIV. D 
