, ( 22 } ) 
fpeciemvd tnodum aciionis y caufamve aut rationem phjjUam ahcubi difi- 
nire , vel Centris (qua funt p unit a Mathematic a) vires vert & phyfice 
P'ibuere , fi forte aut Centra trahereaut vires Cent rot urn ejfe dixero. And 
in the End of his Opticks : Jgjia caufa efficiente ba attraliiones [fc. 
gravitas, vifque magnerica &electrica] peragantur , hie non inquiro. 
Quam ego Attratthnem appello, fieri fane potefi'ut ea efficiatur impulfu 
vel aLo alique modo nob.s incognito. Have vocem AttraEtionis ita hie ac~ 
cipi velim ut in univerfum folummodo vim aliquant fignificare intelliga- 
tur qua corpora ad fi mutuo tendant , cuicunque detnum caufa attribuenda 
fit ilia vis. Nam ex Phanomenis Natura illud nos prius edoftos oportet' 
quatam corpore^fe invicem attrahant , & quamm fint leges (frproprietates 
iftius attrailionisy quam in id inquirer e par fit quanam efficiente caufa pe- 
ragatur attraclio. And a little after he mentions the fame Attra- 
ctions as Forces which by Phenomena appear to have a Being in 
Nature, tho’ their Caufes be not yet known;, and diftinguilhes 
them from occult Qualities. which are fuppofed to flow from the 
fpecifick Forms of things. And.in the Scholium at the End of 
his Principles , after he had mentioned the Properties of Gravity:, 
he added Rationem veto harum Gravitatis proprietatum ex Phanome - 
nis nonditm potui deducere , & Hypotbefes non jingo. Quicquid enim ex 
Phanomenis non deducitur Hypotbefis vocanda eft ; Hjpothefes feu Me - 
taphyfica Jeu Phyfica,feu Qualitatum occult arum, feu Mechanic a fin Phi - 
lofopbia txperimentali locum non habent. fatis eft quod Gravitas 
r ever a exifiat & a gat fecundum leges d nobis expofitas , & ad Corporum 
ceelefiium & Maris nofiri mot us omnes fufficiat. And after all this, one 
would wonder that Mr. Newton fliould be reflected upon for not 
explaining the Caufes of Gravity and other Attractions by Hy- 
pothefes ; as if it were a Crime to content himfelf with Certain- 
ties and let Uncertainties alone. And yet the Editors of the 
Acta Eruditorum , (a) have told the World that Mr. Newton denies 
that the caufeof Gravity is Mechanical, and that if the Spirit or 
Agent by which Electrical Attraction is performed, be not the 
Ether ovfubtile Matter of Cartes , it is lefs valuable than anHypothe- 
fis, and perhaps may be theHylarchic Principle of Dr. Henry Moorl- 
and Mr. Leibnitz* ( b) hath accufed hinvof making Gravity a 
natural or efiential Property of Bodies, and an occult Quality 
and Miracle. And by this fort, of Railery- they are perfwa- 
ding the Germans that Mr. Newton -wants Judgment, and' was not 
able to invent the infinueflmal Method. 
(#<) Anno 1714, menfe Martio^p. 141. 14^. (b) In traffatu de Bonitate Dei 
6? in Epiflolis ad D- Hartfoekcr & alibi. 
