g02 Dr. Brinkley on the parallax, &c. 
This we now know to be the effect of the aberration of 
light. Thus Flamstead’s observations give the maximum 
of aberration 20", or 22"^. The near agreement of this 
with Bradley’s result is much greater than could have been 
expected from Flamstead’s instrument; but the remarkable 
circumstance is, that Flamstead should have been so much 
mistaken in his mathematical application ; and that W allis, 
who interested himself much in the question of parallax, did 
not point out his mistake : it can only be attributed to the 
great age of Wallis, who was then in his 83rd year. 
