p8 Mr. HERSCIIEL on the 
known to me, met with three of thofe ftars that will be found 
in my catalogue : and upon this occafion I alfo beg leave to 
obferve, that the Aftronomer Royal, when I was at Greenwich 
laft May, with his ufual politenefs, fhewed me, among other 
objects, a Herculis as a double ftar, which he had difcovered 
fome years ago. 't'he rev. Mr. iiornsby alfo, when I had the 
pleafure of feeing him at Oxford, in a converfation on the fub- 
je£t of the bars of the fir ft magnitude that have a proper mo- 
tion, mentioned 7r Bootis as a double ftar. It is a little hard 
upon young aftronomers to be obliged to difcover over-again 
what has already been difcovered ; however, the pleafure that 
attended the view when I fir ft faw thefe ftars has made fome 
amends for not knowing they had been feen before me. 
If I fhould mention in my lift of obfervations a few that 
may be found difficult to be verified by other telefcopes, I muft 
beg the indulgence of the obfervers. I hope it will fufficiently 
appear, that I have guarded againft optical delulions ; and every 
aftronomer, I make no doubt, will find, by thofe obfervations 
that fall within the compafs of his inftruments, and attention 
to circumftances neceffary to the right management of them, 
that I have had all along truth and reality in view, as the foie 
objedt of my endeavours ; and therefore he will be inclined to 
give fome credit to what he does not immediately perceive, 
when he finds himfelf fuccefsful where he takes the proper 
precautions fo neceffary in delicate obfervations, even with the 
beft inftruments. 
I have been in fome doubt in what manner to communicate 
thefe obfervations. My firft view was to have methodized them 
properly ; but 1 find them fo extenfive that there is but little 
probability that one perfon fhould be able to bring them to a 
conclufion, for which reafon I have now refolved to give them 
7 unfinifhed 
