( ) 
Meafure that which Mr. Molyneux followed : For 
he made Choice of the fame Star, and his Inftrument 
was conftruded upon almoft the fame Principles. But 
if it had not greatly exceeded the Doctor’s in Ex- 
a&nefs, we might yet have remained in great Uncer- 
tainty as to the Tarallaxot the fixt Stars-, as you will 
perceive upon the Comparifon of the two Experiments. 
This indeed was chiefly owing to our curious Mem- 
ber, Mr. George Graham , to whom the Lovers of 
Aftronomy are alfo not a little indebted for feveral o- 
ther exad and well-contrived Inftruments. The Ne- 
ceflity of fuch will fcarce be difputed by thofe that 
have had any Experience in making Aftronomical Ob- 
fervations:, and the Inconfiftency, which is to be met 
with among different Authors in their Attempts to de- 
termine finall Angles, particularly the annual Paral- 
lax of the fixt Stars , may be a fufficient Proof of it 
to others. Their Difagreement indeed in this Article 
is not now fo much to be wondered at, fince I doubt 
not, but it will appear very probable, that the In- 
ftruments commonly made ufe of by them, were 
liable to greater Errors than many times that Pa- 
rallax will amount to. • 
The Succefs then of this Experiment evidently 
depending very much on the Accuratenefs of the In- 
ftrument that was principally to be taken Care of: 
In what Manner this was done, is not my prefent 
Purpofe to tell you ; but if from the Refult of the 
Obiervations which I now fend you, it hiall be 
judged neceftary to communicate to the Curious the 
Manner of making them, I may hereafter perhaps 
give them a particular Defcription, not only of 
Mr. Molyneux' $ Inftrument, but alfo of my own, 
which 
