*75
Incidat obliquo quantumvis lux ea flexu ,
Scmper hians aliqu id , quo protinus in firm e tu r,
Inveniat, fubeatque novos pars magna m e a tu s .
1155
Hanc 1vitare potes neque vim rationis , ubi illu m
RcgrclTum non jam tribuas obftantibus auris
A e ris , at v itro , qua partes exterioris
Illius extremx lime; idem namque manebit
Nodus in his e tiam , non unquam difloluendus ,
1 1 6 0
Partibus extremis v it r i; cur de inde ‘locata
Unda poft vitrum , radius forbebitur unda
Integer, aut illae non parva parte refractus?
Mutat an hic fele v itrum , faciemque re te x it?
An potius pendent tranfmillus lum inis, atque
1x65
Rcgreflus a r e , qux poft eft cumque locata ?
Pneterca 2 radium vitro in fua fila triquetro
Si diviferis ante , alio fac quemque colorem
Excipias v itro , flexu uno ccdemque cadentem ;
Hujus enim faciem fic obliquare "valebis
1170
V it r i, ut cxrulcum videas refilire co lo rem ,
Dum rubra tranfm ittit lu x , atque imm e rg itu r in t r o .
Jam fi tranlmitlus fit v itri a fron te , rcpullufque ,
S 2
In -
L I B E R N O N U S .
1 Praeoccupat h ic illu d , q u o d
refp on dcri p o d c i ci a r g u m e n t o ,
rcH c& ion en j in e gre flu c v i n o in
a erem non fieri a b i m p a & u in par*
tes Jpnmas aeris , feci in poftrc-
m a s v i c r i : ac id r e fp o n fu m f a
cile refellitur : fi e n im ci v i t r o
a d m o v e a ru r a liu d c ju fd c m g e n e -
n s j f c a t i m to tu m lu m e n tr a jic i
t u r , Sc tam en u ltim a: parces p iio -
n s vitri re m a n e n t caedem . A d d i
p o reft
$c
illu d , q u o d fi p a o lla -
t:m
a d m o v e a t u r fe c u n d u m v i
trum p run o , a n te q u a m a d v e n ia n t
ad con taiflum , in cip it ja m tra
jici pats m a g n a l u m i n i s , E q u i
d em prima o m n iu m p to g r c d iu n *
tu r fila rubea fo l a , rum t r a n f m if -
fis accedunt a h a p o ft a lia e o d e m
o r d in e , q u o fune m a g i s re fran -
g i b i l i a . Id o m n in o d e m o n ftr a c
re flex io n em im p e d ir i a n o v a v i ,
q u am cx crccu t particula: v itri a cce
d e n tis in p a r t ic u la s l u m i n i s , qua;
v i s a g a t in m a j o r e d i f t a n t i a n
fila ru b ea , q u a m in r e l i q u a : p rius
rc r r a h e b a n r u r a t r i a & i o i c j n o r i s
v itr i su p e ra n te a t t r a i f t i o n e m aci is t
n u n c v ir ib u s c i r c u m q u a q u e ja m
aequalibus , p r o g r e d i u n t u r .
a A c c e d i t , q u o d fi
l e n t a c o n -
v e r fio n e p r i f m a t i s a u g e a t u r f u r
fim a n g u lu s in c id e n t ia : iu f e c u n
d a m fu p e r fic ie m ,
p r i m a o m n i
u m in c ip iu n t
rcflecfti in
t o t u m
fila v io la c e a , r c liq u * s a d h u c m a
g n a c x p a rte c r a n f m i f l 's , ru m
p a u lacim a in c o l o r e s p o f t a liu s
d c lu n t in r a d io t r a n f m i l l o , d o
n e c & ru b e u s r e f l e c t a t u r t o t u s .
A n in itio 'm a x ir n a p a r s r u b e o r u m
in v e n it p o r o s , p e r q u o s a d h u c
t r a n f c a t , v i o l a c c o r u m n u l l u s r a d io
lus in v e n ia t ? C u r n i h i l c j u f m o
d i a c c i d i t , u b i p r i m o v i t r o f e
c u n d u m a d j u n g i t u r *
