( <* 3 7 ) 
ber of little Articles neceflary to thePratfice,the Author 
refers them to another Time, as more properly belong- 
ing to the Defcription of the whole Art, than to a 
Memoir in which he only gives the Principles of it. 
IV. A Letter from the <%eVere?id Mr. James Brad- 
ley S civilian (profeffor of Aftronomy at Oxford, 
and F to ZV.Edmond Halley Aftronom. 
Reg. See, giving an Account of a new dif- 
fered Motion of the Fix'd Stars, 
SIR, 
Y OU .having been pleafed to exprefs your Satis- 
faction with what I had an Opportunity fome- 
time ago, of telling you in Converfation, concerning 
fome Obfervations, that were making by our late wor- 
thy and ingenious Friend, the honourable Samuel 
Molyneux Efquire, and which have fince been conti- 
nued and repeated by my felf, in order to determine 
the ‘Parallax of the fixt Stars ; I fhall now beg leave 
to lay before you a more particular x\ccount of them. 
Before I proceed to give you the Hiflory of the Ob- 
fervations themfelves, it may be proper to let you know, 
that they were at firft begun in hopes of verifying and 
confirming thofe, that Dr. Hook formerly communicat- 
ed to the publick, which feemed to be attended with 
Circumftances that promifed greater Exa&nefs in them, 
than could be expected in any other, that had been 
made andpublifhed on the fame Account. And as his 
Attempt was what principally gave Rife to this, fo his 
Method in making the Obfervations was in fome 
Mea- 
