C 501^ ) 
^vel denime per CHjfifqurdll dtlMationem am difraMonm In comf lures 
vergentes radios : turn {me pfierms Prifma magis diffmderet ac diffiparei 
radios per diclas irregHUrlmes ather^, a&ris, mt vitri^velper lurat^m di . 
latMionem lumms a refringentis {uperjiciei refiftentla demo cor.fiipmi ac di^^ 
frfi, vet et tamper cnj^f^ne rddti a priori difra^ione ortl iter at, m diffra^k. 
mm at divifionem In lon^e plures divergemes radios, ^Et fie Lumen mqis 
dlfpergetetHr per refrabtionem fecMndi Pri/matu, & in p^rietemprojelfm 
Ima^nem dmlo Icngtorem minimum exhiberetj qudm^ perfoUm {refraUiQnem 
^riork Prifrmpi^xhiberi potdf{et, ^^mpkrem cum ^ experiemia teBe, 
refraBiofecmdi-Prifinath adeo nqn difpergat lumen ut contrahat & in prijii. 
mm ft^ at urn reheat , effid^tque m k forms Coni pofiea progrediatur , perlnde 
ac fi nnllam omnino refraUioTiem paf^m friffet h concedendnm efi: .Diffpifionem 
Luminis^ a refraB-ione anterioris Prifmatis ejfetUm ^non oriri ab alicjuapr^* 
fdtarpm caufartim, mt afia^quavis irregularit^ite^ fed diver f<& refrangihili. 
tati diverforum radiorHmfolummodo trihpiendam effe ^ utpote quk radiifs mnf- 
cjuifque^ ex infitadifpofitione t ant am rtfra5lionem in pofteriori Prifmate ac in 
priori pajfus /edmimr in parallelifmHm cnm feipfo h ^ fic omnes radii ad fe 
mutm eafdsm inclinationes refummt quas ante refraUiones habuere, 
Demum^ at hac omnia fumme confirmarem, adject Experimentum illui 
qmdjam nomine Crucis paffim infignitur : de cu]us conditionibus cum R. ?, 
dubitaverit ^placuit jam defignare Schemate. Sit BC anterior tabula^ m 
Prifma A immediate prjefigitur^ fitque DE altera tabula^ quafi dmdectm 
■pedibus abinde dijians, cm fuffigitur alternm Prifma TabuU autem ad% 
<^ y Ita perjorsntur^ m aliquantulum Incis ab anterior^ Prijmate refr^^^t 
trdjcipsjfit per mrumque for men dd fecHndum Prifma, inque eo denmn' 
fringk fam Prifma mterim circa axem reciproco motu convert atur, & 
lores in TahuUm pofieriorem D E procidentes.per vices mtoUentur '-^c depri- 
mentur, eoquepano alius at qu^ dim color [ucceffive pro arbkrio traijcipotsf 
per foramen ejus Y ad poflerim Prifma, dum c^teri color es In Tabulam ir^' 
ymgnnt : Et videhi^^radiQS diverp CQisrib^ fn^dkos diverfampati refraSi^' 
