479 
Mr. Pond on the parallax of a Aquilce. 
After so many fruitless attempts to establish the existence 
of sensible parallax, I was much disposed to abandon all 
farther prosecution of this subject, when my anxiety was 
again renewed by the paper Jately communicated to the 
Society by Dr. Brinkley. The arguments and observations 
which it contains, are such as no doubt require very attentive 
consideration ; but I think some of Dr. Brinkley’s doubts 
have arisen from my not having myself been sufficiently 
explicit as to the details of my own observations, and the 
precautions I have used. However this maybe, it seemed to 
me more than ever desirable to institute some new process of 
investigation, to which none of Dr. Brinkley’s objections 
could possibly apply ; and it has occurred to me, that perhaps 
the observations made with the new transit instrument might 
be sufficiently exact for this purpose, though taken under 
very unfavourable circumstances. This was a question to be 
easily determined by inspection, and I have the satisfaction to 
state, that I find the observations of « Aquilas, already made, 
quite sufficient to establish this important point ; namely, that 
the parallax of this star is either an insensible quantity, or is 
so extremely small, that it cannot possibly have had any share 
in producing the discordances observed by Dr. Brinkley.* 
• These observations, as likewise some additional ones on other bright stars, con- 
tinued to the month of September, will form the subject of another paper. 
