Perfundat. Ratio e ll ho rum tam certa p ro fe ro ,
Irim ut qui nunquam v id ifle t > d icere , qualis
Surpere deberet c a d o , cum fp icu la Phoebus
J35
Vibrat in adverfas undarum luc ida guttas,
Ille quidem pollet , qua: p lu rim a diximus ante,
Edodus , lucifquc v ia s , & munera nolcens ;
'Amplius exortam nec jam Thaum an te putaret,
Junoni famulam nec ite r con lle rne re ab aleo
540
Vehere labenti; led veram ce rnere t artem
N a tu rx , qua dilabi fit m u lta neceire
Protinus ex oculis m ira c u la , d ifiic ilcm quc
D i.iolvi , qui dignus erat jam v in d ic e , nodum .
Pulchra 1 fit Iris , ubi cfi adve rfum rolcida nubes 545
fedu&a in Solem, rad iifquc ob jecta per auras
Pli/rima gutta cadit pluvias , vel Tpargitur humor
Pontibus erumpens , humcdlat
ik
aera circum
Rorans; femper eam cu rva rie r orbis in xqui
Aipicies arcum ; p e r S o lem , oculumquc meatus
55©
Et qui redus eat , med ium ejus tra jiric o rb is .
Sed
L I B E R O C T A V U S .
143
1 P rim o loco p r o p o n it h i c N o -
A e r, ubi , & q u an d o I r is a p p a r e a t ,
tum ejus fo rm am p e r l e q u i t u r ,
& d iligen ter e x p o n it . Q u o t i e s
cu m q u e
h ab e tur a t e r g o S o l ,
a fio n te ingens n u m e r u s g u t t a
rum a quas live e x h a b e a n t u r in
plu via , live in a q u a
f o n t i u m
difpcrfa in g u t t u la s , f e m p e r a p
paret Iris , d u m m o d o n i h i l o b f t e t
radiis, q u i ad ipfas g u t t a s a d v e
n ian t ab ipfo (o le ,
&£
in c e r t a
qu ad am d irection e
a g u t t i s a d
o c u l u m . Ejus fo rm a f e m p e r e f t
circularis , &:
c irc u li
c e n t r u m
jacet in rc<l>a , q u x c o n c i p i a t u r
d u tta a cen tro folis p e r o c u l u m
fp e d a to r is . Sed non v i d e m u s c i r
culum in te g ru m , i m m o p l e r u m
que ne fe m ic irc u lu m
q u i d e m .
A pp aret fcn ucirculus f o l c p o f i t o
in h o rizo n te , q u o e l e v a t o , c o
m agis deficit a f e m i c i r c u l o a r c u s
Iridis v if x , q u o e l e v a t i o i p h u s
folis fupra h o r iz o n te m e f t m a j o r .
P o rro apparere
f o l c i u
bin ae
I r i d e s , fi p lu v ia fit m a g is v a f t a
Se d c n f a : d en fitas a d ju v a t f e c u n
d a r i x
p h x n o m c n u n i , q u x
e f t
e x t e r i o r , & la n g u i d io r , ac r a -
r i u ^ o c c u r r i t : u tr a q u e h a b e t fe -
r i e l f i
c o l o r u m e a n d e m , q u a m
i l l u d c o l o r a t u m f p c & r u m p r i f m a -
tis , fe d e o r u m o r d o e ft c o n t r a
r i u s : p r i m a r i a h a b e t r u b e u m e x
t e r i o r e m , qu i e m in e t id circo a l -
t iff im U s in f u m m o a r c u , v i o l a
c e u m i n t e r i o r e m , a d e o q u e it id e m
i m u m : fe c u n d a ria c c o n tr a r io h a
b e t r u b e u m in te r ib r e m , $c v i o
l a c e u m e x t e r io r e m : in ^ utraque
r u b e u s h a b e t lim ite m fatis d i f h n -
<
5
t u m ,
v io la c e u s e v a h e fe it p e r
g r a d u s
fe re in f e n f i b i lc s , q u o d
q u i d e m a c c id it e tia m in f p c & r o
p r i f m a t i c o , & fu m m a m d iffic p l-
t a t e m p a r i t in ju d ic a n d o de a b -
f o l u t a
lo n g it u d in e
( p c & r i ,
l a t i t u d i n e Iridis .
S e m i d ia m e te r Irid is p r i m a r i x
o c c u p a t iu f u p c if ic ic f p h x r x e x -
