. ( 5012 ) 
A Second Letter of p. P^ri/V/, written to the Publiflier from 
M^j 21. 1672. K^oyii'Meypms Anfwer , made to hisfirft Letter, 
printed in Numh. 84, 
Bdsut^ mihlfmt tU£ liters cum Ohfervmonihus Clmjfmi^ mne Ings^ 
KioJJimlNcwtom, qmhm dd mea4 difficulmes reffondh. Ecu egq 
kgi non fine maximal vohptate : Et frimumy qmd attinet ad^ ipffm Expert^ 
msntummajork Latitudint^ colomm quam exigeret vulgaris Theoria Re- 
fraBignufn h f^teor, me inaequales refra^lones in oppofitis Prifmaw fade- 
b^ fuppofmjfey nee HlUtenm advertise in Uteris reUtis in Tranfadiioni-. 
bus, ohfervatamfrnffe a ]>icwtono major em il/am latitudinem ineocafnin 
qmrefraciiones pnerentur reciproce X(\\X2i\ts^ eo modo qimMc in ifiis obfer* 
vatimihHs dicimr> Sed nec ah eo tempore In iifdem Tranfaftionibus vidg" 
re licmt^ cum eas non potuerlm recuperare^ Chm igltur nunc videam^etim 
in eo Cafu obfervatam major em illam Color um latitudinem ^ certe ex hos c^' 
pke nihil mihl ulterlns reft at dijficultatis : Ex hoc ^ inqnart^ycapite \nam 4- 
iimde videtur fdjfe reddi ratio illius Phmomsni ah [que ifi^avaria Radiormi 
Mefrangibilitate. Etenim ia 'ea Hypothetic qmmfufse explicatnoflerGru 
maldus, in qua fupfonitur Lumen effe fubftantia qudtdmi rapidijfime mota^ 
fo[fet fieri aliqm djfufio luminis pofl tranfitum foraminis & decpiffatienem. 
radiorpim. Item in ea Bypothefi^ qua lumen ponitur progredi per certas q'^afi 
dammateri<e fiubtilis Vmulationes:, m explicat fHbtiliffim'46 Hookius, pofi 
fmt expiicari color es per certam^quandam. dijfiufi'onem At que expanfionem Vri' 
d^latiomm^qna fi:!{t dd latera radiorum ultra foramen^ ipfo con t agio ipfa^m 
mMeri^ continmtione, Certe ego talem adhibeo hjpothefin in DifTertatione 
de motu undulationis, qua: eft fiextapars me or urn Mechmicornm \ ut fo^ 
nam^ colores iftos apparentes fieri ex fold ilia Commmicatione motionis^ qM 
^b ZJndulationibfis diri^ii prosedentibm ad latera ejfundatur XJt^ fi radii 
intrMtes per foramen a progrediantur 
versus mdulationes quidem direlU 
terminari deherent ( habendo rationefn d 
motum return & naturalem) ad linem 
reEham a b • nihilominus tame^^ proper 
eontinuitatem matericefit aliqua commH- 
nicatio commotionls verfus lattra cc, 
pibi trmula qmdam & crifpans fuccnf- 
fio excitat^r : Atque fi in ilia later S 
crifpatione confiftere color es fufponatur^ 
exiftimo omnia ph<tnomena colorum eX- 
f licari pofe, m f^iJtMS in ea ^. quam dixi, Dljfertatione expoM&. ^^ih^- 
item pofitis- afft^r^et etiam ^ cm ultra quam ferat .radiorum ipfor^m div0i' 
satio, expandi colorum Utit^'dmm mcejfejit^. Verhm (ft a obiter hie tAnthm 
admtaffe fufiiciat^ \ " - • j ^ 
