Sic fucata illos fignabit fimbria fines
Alba & nigra inter loca ; fic ubicumque minorem ell 2210
Tranfitus ad lucem , duci quoque fimbria debet,
Non tam clara tamen , neque vivo tinfbi colore ;
Num qure fila locis a Splendidioribus adfunt
Frada ma.»is , cum detortis minus , eque minori
Lumine difTufis filis commi xta ( vel hrec tu
2*215
Converfa ilatuas fieri vice ) , cana profedto
Non poterunt fieri ; nequeunt namque omnia jungi >
Sed quem par mi xt i s , ollendcnt clfe , colorem.
Si 1 triquetrum trans vitrum itidem tueare papyrum ,
Cujus dextera pars mi n i um, violamque finiltra
2220
Mine illinc referat , medius fiet limes ut rique;
Atauc ira fi verras v i c rum, fiuffoilier ut res
lnlinciis filis videatur ; lreva videri
Pars mage luitolii charcre , quam dextera , debet ;
Uc (I revera (it in illo limite (eida.
2225
At vitrum fi tu triquetrum fic deinde revolvas ,
Ut rem fila magis depreilam offendere pofi int;
Qux viola clt , minio depreflior apparebit.
Quapropter videas rufis magis hic quoque filis
L I B E R S E P T I M U S .
107
1 A c c e d it a l i u d d u p l e x e x p e r i
m e n tu m , q u o d c o n f i r m a t , c a f d e m
cllc p r o p r i e t a t e s l u m i n i s
r e f l e x i
a c o r p o r ib u s n a t u r a l i b u s ,
t e
l u m i
nis c o n t e n t i in r a d i o f o l a r i , c u m
e v in c a n t m a j o r e m r e f r a n g i b i l i t a
tein lu m i n is r c H c x i a c o r p o t c v i o
lacco , q u a m a r u b e o .
r i m u m e l l h u j u f m o d i : t r a n f p i -
cia tu r t r a n s p r i f m a c h a r t a , c u j u s
d im id u m Iit i m b u t u m c o l o r e r u
b e o ,
te
a l t e r u m d i m i d i u m v i o l a
ceo ita , u t p e r i c f r a £ t i o n c m a p p a
rcat d i m o t a a l o c o l u o in d i r e c t i o
ne lim itis d i r i m e n t i s c a s b i n a s p a r
t e s : a p p a r e b i t p a r s v i o l a c e a p r o c u r
rens u lt r a r u b e a m , d i m o t a n i m i
r u m l o n g i u s a l o c o f u o p c c r e f r a -
f f i o n e m m a j o r e m , q u a m (it r e f r a
g i o p a r tis r u b e r e .
S e c u n d u m e l l h u j u f m o d i : a d v o .
lu to l i l o n i g t o e i cl a n a : i t a , u t id
p r j e t e x a t u t r a m q u e p a r t e m , q u re
i l l u m i n e t u r in t c n e b r i c o f o c u b i c u .
Io l u m i n e t r a n f m i i l u p e r t u b u m
q u e m p i a m in e a i n i p f a m ( o l a m ,
n e l u m e n a b e a d e m l u c e r n a d i f -
p e r f u m
p e r
c o n c l a v e
,
te
r e
f l e x u m
t u r b e t
e x p e r i m e n t u m :
t u m
a p p o n a t u r
l e n s
v i t r e a
i n
d i f t a n t i a m a j o r e „ q u a m lit c i u s
l e n t i s f o c u s r a d i o r u m p a r a l l e l o
r u m , & q u r e r a t u r d i l t a n t i a a b
i p f a l e n t e , i n q u a i m a g o e ju s c h a r -
t x p i n g a t u r v i v i d i f i i m a , q u o d f a
c ile p a t e b i t e x i m a g i n e f i l o r u m ,
q u n : a p p a r e n t d i f t i n t t a in f o l o f o c o
e j u s le n t is , a c in d i f t a n t i a p a u l l o
m a j o r e , v e l m i n o r e c o n f u n d u n t u r ,
t e
c v a n e f c u i u .
P o r r o i n v e n i e t u r
d i f t a n t i a m a j o r p r o p a r c e r u b e a ,
m i n o r p r o v i o l a c e a , q u i a n i m i r u m
fila lu c is y i o l a c e a r c f r i r g u r . t u r m u
g i s ,
rubea
m i c u s .
