PHYSICAL ann LITERARY. 57 
true places to a certain diftance, by the 
proportion which the velocity of the 
earth bears to the velocity of light : It is 
plain therefore, that, on our hypothefis, a 
ftar muft have a different apparent place 
for every different colour; that is, ics ap- 
parent disk mutt be extended by the aber- 
fation into a longitudinal form refen- 
bling the prifmmatic fpectrum, having its 
_ Ted extremity neareft to its true place. In 
the ftars fituated near the pole of the eclip- 
tic, its length fhould continue always 
the fame, though directed along all the 
different fecondaries of the ecliptic in the 
courfe of a year: But, in thofe which lie’ . 
im or near the plane of the ecliptic, it 
fhould be greateft at the limits of the 
eaftern and weftern aberrations ; ; the ftar 
recovering its colour and figure when the 
true and mean places coincide, But, 
there is no hope of difcovering, whether 
our hy pothefis be true or falfe, by this 
“confequence of it ; for the greatett length 
of the dilated disk, being, to the whole 
berration, as the difference of the velo- 
¢ ity of red and violet to the mean velocity: 
‘ee Vou, II, H of. 
‘ 
