3J 



(isquc cenlia solis ol planelnrum, sine virliilis diminutionc; 

 quacque agil iion pro quanlilale superficieruu! parlicularum, in 

 quas a^it (ut soIcmU causae inechanicae), scd pro quanlilale ma- 

 leriae solidae. — Uationem harum gravilatis proprielalum ex 

 phacnoinenis nonduni pötui deducere el hypotheses non lingo. 

 Satis esl quod gravilas revera exislat el agal secundum leges a 

 nobis exposilas. ^teivton, I'rincipia Phil. nal. p. 67G. — 

 To Icll US Üiat every species of Ihings is endow'd wilh an occull 

 specifick qualily by which il acts and produces manilest eflecls. 

 is lo lell US nolliing: bal lo ilorive Iwo or ihrce general piiii- 

 cipks of molion from phaenomena, and allerwards lo lell us how 

 llic properties and actions uf all corporea! Ihings follow iVom 

 those nianifesl principlcs, would bc a very greal slep in Pliüo- 

 sop{)y, thüugh Ihc causes ot ihosc principlcs were not yel dis- 

 covcred : and therefore I scruple nol lo propose the principlcs ot 

 inotion and ieave Iheir causes lo be lound out. 'Dieivtou,. 

 Opticks p. 377. <vrül)t'r, Query 31 p. 331, l)ei^'t eö: JJodies 

 acl one upon anolhcr by ihc altraction of gravily, inagnelisni 

 and elcclricily, and iL is nol improbable Ihal ihere may be nioie 

 atlraclive powers ihan Ihese. How ihese attraclions may be per- 

 formed, 1 do nol here consider. Whal I call allraclion, may bc 

 periormcd by Impulse or by some olher means unknown lo me. 

 1 use thal word here lo signily only in general any force by which 

 bodics lend lowards one anolher, whntsoever be Ihe cause. 



*' (@. 23.) 1 Slippose the rarer aelher wilhin bodies and 

 the denser without Ihem. Operum N e w l o n i Tomus IV. (ed. 

 1782 eam. j>in->^lei;) p. 386, mit Qlinueubung auf tu dvUaxmi^ 

 ber von ©rimalbi eiitbecfteii S^ifTractiini ober 2icl)tbeu3imö. ^^(m 

 ©itliMje tc6 ^^liefe» uou ^teaUou au Diobert 33oi}le Dom ^fbr. 1678 

 p. 394 t)eipr eö: I shali sei down one conjecture more wliich came 



in^o my mind: il is abo.il the cause of gravily 2fucl) t>k 



(Sorrefvoubenj mir Dlbentnirg »om 3)eceml)er 1675 beiueift, ta^ 

 ber grope Waim bamal^ beu ^:}leri)LT:ji)i;;>i)t()CKn uid^r abgeiictijt 

 war. Tiad) tiefen füllte ber Src^ bei? materiellen 2ic^tei< beu 

 ^Hetl)er in ^rfjiüiuguug fefjeu; tie ©cbiinnauuiien bei5 ^^letljert^ allein, 

 iiH'ld)er ^^erunuibt|'d}aft mit einem ^^leruen-JUiibum l)at, er^engren 

 \\ui)t Da^ 2id)t. 6. über beu Streit mit j^oofe J»)oi<^lep T. IV 

 p. 378-380. 



91 ü. .«jumtolt-t, iloeiuoe lii 3 



