tfea. 'to; T#o or Three whole Minutes Bat himfelf 
Qould, with TelefcopuJl^Sights, (by an laftrument but ot 
a' Span breadth,) make obfervations, Thirty, Forty, 
Fifty, yea Sixty times more accurate , than could be 
done the other way with the moft Vaft Inftruments* 
And, npon the Juthors publifliing that firft Part oi his 
Machina CoeleJHs ("wherein all his Inftruments are accu- 
rately defcribed ) Mr. /:/<?<?/^publiflied his Animadver-^ 
fwns thereouj with much more ofbitternefs and boaft- 
ing {as this ^is^^^^^ thinks^ and others alio whom the 
Author cites,) then there was reafon for. Which he 
thinks was done out of defign to difparage Him, his In- 
ftruments, and his Obfervations Cunfight and unleen, j 
and to prepoffeis others with mean and flight thoughts 
of them, (even before they were yet publiihed and a 
high opinion of himfelf who (with fo little charge and 
fo fmall Inftruments) could do things fo much more 
accurate than had hitherto ever been done, by any; thus 
leeking to raife his own reputation by difparaging what 
is^done by oth€rs,in things wherein himfelf doth nothing. 
' T\\Q Author thinking the' Credit of his Obfervations - 
(and confequently the Benefit which the Publike might 
receive from them j to be herein much concerned ; (for, 
if they were not to be trufted or relyed upon, with more 
accuratenefs than with the latitude of two or three mi° 
niiteSi they would f all much fliort of what tile world ex- 
pend from them : ) he complained hereof in his Letters 
todivers learned men, |iid particularly to thofe of the 
l^yal Society , defiring mat right might be done him in 
this point. For that a difference of this nature, was not 
to be determined by conjectural fpeculations which a 
man may project to himfelf, (who brags only what great 
things he can do, but doth no thing : ) But by Pradick 
experience, and Trials adually made both ways; and 
tliefe duly examined and compared by perfons compe- 
tent to judge of fuch matters, 
: • - ^ For 
