( ) 
The next Article of his Obfervations, is the Con- 
tinuance of the Axis in the fame Parailelifm, through 
the whole Orbit of the Planet. This is fo neceffary 
and obvious a Confequence of the eftabliOied Laws of 
Motion, that there needs no more to be faid about it. 
The 4th Article contains an Account of fome Ob- 
fervations made to determine the Parallax of Fe/^us 
in the Year 1716 : The Method he ufed for this Pur- 
pofe, was to take the feveral Diftances of Time be- 
tween the Appulfe of the Limb of Ferns and of 
gu/us (which Star fhe pafs’d by about that Time) to a 
horary Circle very near the Meridian, and to another 
about 6 Hours after, which he meafured by the Pul- 
fes of a Watch, of which 143 went to i firfl Minute 
of Time. He iikewife obferved the Alteration of thofe 
Diftances taken at the fame Hour feveral Days one af- 
ter another, and allowing a proportional Alteration for 
the Time between the two Obfervations, he com- 
put^^d what the Difference of their right Afeenfion 
ought to have been in the latter of them, if there 
were no Parallax ^ then comparing this Difference 
with that obferved, he concluded the Difagreement to 
be the Parallax of right Afeenfion. This Method 
the Author feems to depend on fo mu h, as to thin c 
that an equal Degree of Exadnefs is hardly to b) 
expeded from any other hitherto pradifed: But ic 
we confider that the whole Parallax of right Afeen- 
fion amounts by his Obfervations to no more than 4 
Pulfes of his Watch, and that he allows a Poflibilitv 
of an Error of near one of thofe Pulfes in taking each of 
the TranfitSjit is evident that if fuch an Error be aduall y 
committed in each of the Obfervations on which the 
finding of the Parallax depends, and all of them hap- 
2; pen 
