i $• Ad hoc requiritur,tum,ut fit pervium , tumutfubftantia:habeat tenuitatem & fubtilitatem,utfer eam poflit Iumcnintimapenetrare.

24 Perfpicuaaliaingenitumhabentlumen ,utcoelum, ignis & fulgentia: alia mutuaticiu. Cur. d- 1 .

Hircrurfus iuntvelfimplicia;ur,aer&aqualVel compofita» vitrum,cornu cryftallus, Ar. z, dean. t.68.

26. Lumen eft a&us corporisperfpicui» quate-nus perfpicuum eft. Arift. d. 1 .1. 69.

47. Hic duae qusftiones controverfe difeutien-d#funt; quarum prima haec eft: Utrum lumen &: luxdifferant, an vero fint unum idemqj ?

z8. Nosaffirmamusutrumq„fedratione diver-fa.Nam lux.& lumen lunr unum idemq;, quatenusfuntqualitaslumin 0 fa. Urf.d1fp.1j. quaft- ili. Phil.

z*j. -Differunt y, 1. ratione fubje&i cui infunt.Lux enim proprie e ft in corporelucido, ur, in fole 5 caliisaftris, igne alhsq;: lumen vero in corpore per-/picuo tanquamtrf&'TpA*1<x.fc Zab.c. 4-l.r. de,vif.

30. II* Ut caufa & effe&i m.,. Lumen enimeft cffe£him,opus lucis Sc. ex. 71.fi l.Eft imagolucis fimilitudo Ex. 7^, f. 1. item'fpccies & repraffen-tatio lucis,a qua eft generata: ficut proles profert pa-rentem. Dn.Gocl, inprodr. lex, : Phil. q. 38.

31. III. Lumennoneftdurabile:infenfibilimo-do fit,& rurfum defit: non permanet in corp ore per-fpicuo, fed ixpc ab co a&u fcparatur,fuccedenti-bus in eius locum renebris: lux vero femper perma-net in corpore lucido ,neq5 ab eo feparari poteft ial-