Et mutare vices, cum obverfa fit altera prorfus
209$
Ad primam plaga, frons difpar quia vertitur illuc*
A t fi nec prima, ncc item ratione fecunda
Altera cryftallus llatuarur, at ejus ut extet *
Obliqua ad prini, m plaga; dc (e reddere prolem
iHcipiunt
radii , binam tum quifque , duofque
2100
Effundunt ramos, duo
lumina,
moribus inter
Se diverfa tamen; confuetis alterum, &
alterum
Inflictis ( fratrum diicordia tanta! ) tenetur,
Ut diverfa plaga latera exponuntur eadem .
Protinus * expofitis tot luminis, exque plicatis 2105
Muncribu* , caufifque , prope ipfis atoue clementis,
Quredam adeundum alia eli naturx effecta micantis .
Et primo noftros oculos percellit , & intra
Procudit fpeciem, mentemque•exinde laccffit,
Corpora qux fubito tum percipit illita luce.
2110
A t qua lefe illuc v i, qua ratione, viaque
In finue t, noftrxque adeat penetralia mentis?
Corporis hanc agitat molem mens edita fumma •
Arce velut; fiquidem dans celfa in fede cerebri
Jufia dat, & recipit, varius quas nuntius extri
2115
Res affert: illinc per corporis undique partes
Funduntur nervi , rami velut , exorientes
M u lti dc paucis cralTi minus , atque abeuntes
Polt in fila , cutem per totam tenuia longe,
Et
3*8
P H I L O S O P H I A
f i t a ,
te
contra .
*>
Si bin arum cryftallorum pia-
9i
n a perpendicularis rcfra& io n is
, , fint inter fc , n cou e parallela,
„ n eque ad p erp en d iculum pofi-
t a , fed a n g u lu m acutum co n -
9y
t i n e a n t ; jam d uo rum illo ru m
, , radio rum c p rim a cryftallo e-
m e rg e n tiu m uterque dividetur
„ infuper in binos radios in in-
3>
g rcflu fccu n d x c r y f ta lli. Ete-
3> n im in h oc cafu radioli , cx
a, qu ibu s uterque iflo rum radio-
j , rum c o n f t a t , h ab e b u n t alii la-
„ tcra fua in u fu a rx rcfra& io n is,
alii autem
latera
fua altera
c o n v c rfa ad p la gam in u lita tx
re fr a d io n is fc c u n d x cryftalli
H u c u fque N c v v to n u s , qui m e
ditationes fuas
ibi p r o t u l i t ,
te
c o n jc& u ra s m eo quid em judicio
n on fatis d ig e ft a s ,
te
evolutas:
videtur m ih i' h oc a r g u m e n tu m in
d igere p lurim is aliis o b fe rv a tio
n ibus ,
te
exam ine n o v o accura
tiore .
1 P o ft expolitas om nes proprie
tates lum inis ,
te
p ro p rie tatu m
caufas m echanicas , delabitur N o
fter ad alios quosdam effc& u s
ipfius l u m i n is , inter quos p rim o
lo co p ro p o n it fen fation em , q u am
cx ciiat in n o b i s . C u m corp ora
a gan t in lum en , d ebet o b x q u a -
lita tem a & i o n i s ,
te
rca& ion is
te
lum e n a gere in c o r p o r a , in q u o-
