L I B K R S E P T I M U S .
7 ?
Et quoniam 1 docui radios debere refractos
1605
plurima d is jung i va rio rum in fila colorum ,
Inquires ccrtc > radium cum quQdJibcf jre
In corpus facies , ub i fin t ca fila , nec u fquam
Plerumque inven ies : mea ne fa llacia pro inde
Didia putes, age nunc , nequeant cu r fcpe v id e ri ? j t f j o
Evolvam caulas , quxquc ars adhibenda , co lo rum
Ut feptem pa te a t feries ea pu lchra , docebo .
Primo - trans faciem fi lux eft fradla , rem o tis
Protinus illa locis e rit e x c ip ie n d a , co lo rum
Septeni ut p o fiin t oculos pe rfunde re fuci ;
1615
f^3mquc opus
longum filis ite r ire r e te x tis ,
Disjundhi u t p ro rlu s f i n t , &. d ife re ta v i c i l i im ; .
Nam ciuTus b re v e cum lp a tim n , atque in o rig ine p runa eft,
Non tibi tunc , ardhita n im is conftrictaque , IcQjrfum
Fila videbuntur flexus prope v e rticem ; eundo
i 6 z o
Jncrcfcit fp a tium , & la te fcun t fila co lo rum •
Lux
3
ea p tw te re a perquam fu b tilis , opo rte t ,
Sit rad ii, in g r e d itu r qui c o r p u s , transque fo ram en
Exi*
I Saepe a c c i d i t , u t , l i c e t r a
dius tranfeat e x u n o m e d i o i n
aliud divcrfa: n a c u r x , a d h u c t a
men colores n e q u a q u a m
a p p a .
rcant ; ne i n d e v i d e a t u r e v e r t i
tota cxpofica
t h e o r i a , p r o p o n i t
hic e x p o n e n d u m , q u i d r e q u i r a
tur ad
h o c ,
u t e o i o r e s a p p a
reant ,
te
q u i d c a v e n d u m in e x *
p e r i m e n t i s , u t c a r i t e f i j c c c d a n t .
a In p r im i s fi r a d i u s e x c i p i a
tur in lo co n i m i s p r o x i m o i l l i ,
iri q u o fiat
r e f r a g i o j c o l o r e s
n on a p p a r e b u n t , q u i a
c u m d i f .
f e re nt ia r e f r a c t i o n u m f i t e x i g u a ,
d i ve r g en t i a f i l o r u m c o l o r a t o r u m
e f . e x i g u a , a d e o q u e n i m i s e x i g u a
e o r um d iftan tia p r o p e ’ v e r t i c e m i .
pfius a n g u l i , q u e m c a e f F o r r n a n t .
Si p erg an t ciam i l l i s d i v c r l i s d ire *
f tio nib us , i ta r e c e d e n t a fe i n .
vicem , ut p o f t m a j u s q u o d d a i n
ih t c rv al lgm i n c j p i a t c a d e r e f u b
fenfus ea i p f a d i f t a n t i a .
j D ei nde r a d i u s i n c i d e n s d e b e t
efle
tenuis, adeoque tradu&us
p e r f o r a m e n e x i g u u m : fi e n i m
r a d i t i s e f t a m p l i o r > is - c o n c i p i e n
d a s e f t , u c c o m p o f u u s e p l u r i
b u s r a liis a r d i o r i b u s , q u o r u m
q u i v i s d i v i d i t u r i n f i l a f u a c o l o r a
t a . H i n c
u b i
ii d e m u m e x c i
p i u n t u r i n c h a r t a , v e i p a r i e t e ,
h a b e b i t u r
i n
p l u r i b u s
p u n c t i s
c o i i c & i o o m n i u p r i f i l o r y i m , q u o *
r u m
l i n g u l a p e r t i n e b a n t
p r i u s
a d d i v e r f o s r a d i o l p s , a d e o q u e h a
b e b i t u r i t i d e m c o l p r a l b u s c o i u p o -
f u u s e x iis o m n i b u s . S o l u m i n e x
t r e m i s m a r g i n i b u s h a b e b i t u r e x
p a r r e a l t e r a
r u b e u s ,
&c
a u r e u s ,
e x a l t e r a c a e r u l e u s , & v i o l a c e u s ,
c u m f i b i p r o x i m i s , q u i a i l l i p e r
t i n e b u n t
a d
p r i m u m r a d i o l u m
p o l i t u m v e r f u s p l a g a m r a d i i d H
r e c t i , q u i r e m a n e b u n t f o l i , n i
m i r u m r e l i d t i r e t r o a m a g i s r e -
f r a n g i b i l i b u s , p r o c u r r e n t i b u s u l
t e r i u s , 6
c
h i a d
p o f t r e m u m ,
e x c u r r e n t e s u l t r a r e l i q u o s o m n e s
m i n u s r e f r a n g i b i l e s r c l i d t o s n i
m i r u m
a
c c r g o •
