2 1 Ohferv Mio IJt. De Iride Solari ML 



defcribarruefl: illa arcus cosleftis ui>icoIor albus tempore iEqui^ 

 noaiorum^pr^^femm Aucumnaliumaccidens.aSoleexorien^ 

 cein oppoficos fibi vaporesrofcidos nebulasque dcnfas & craC 

 ftsmediiaeris, in nubes pluviales non lum concrecas , fed ^ 

 Phoebi radiis, non aucema vencis> defiiper in cerram detru£ 

 fas,qu6pofl:meridianumcem.pusicrenicas aeris inde reluce-^ 

 fcac, efFormatus, & in ipfis nebulis vifui pacens. Caufa igi* 

 CureflicienshujusarcuseftSoi auc ejus radii : eaofa vero ma- 

 tcriahs vel (abje£lum eft vapor rofcidus, craffus, five nebul4 

 denfa, defuper in cerram vi radiorum folarium detrufi,& non4. 

 duminnubemfuperius denfaca, aut in guctulas piuviales co- 

 adla &refbiuca. Diiferc igicur Alba haec Solaris Iris , a verfi-. 

 colore, quodh^cgignacur . qtav dp^nTsif veiv> »V« ffwtg-^rdi 

 ^'c 45;«ac/^4ec, juxcaAriftocelem, &:cumguccui^ pluviarum per- 

 (cCtx conglobac^ ad eWr^a apcas , ex nube denfa decidunt : illa 

 vero Iris alba exiftac npn in guccuhs pluviarum, fed materia 

 falcem earum, nempe vaporerofgido. Hicenim vaporobmi-t 

 nuciirimaatomorumiiiftarcorpufcula, humida, &vaporofa 

 humanis ocuUsfpecuIa colorata a radiis fbiaribus, & refrafta* 

 exhibere nequi t , unde color albus necelTarid emergit. Sicuti; 

 enim guttulceintegrx^ inftaj: glaciei pum & cryftalli y five vicri 

 peilucidi &cIari,juxtaanguIorum variecatem, a lumineSoIisi 

 incidence, variis coloribus refranguntur : ica minima vapo-i 

 rum roicidorum corpufcula , iiillar glaciei ra& & in nivemi 

 candidamredafl^, velcryftailiaucvicriadinftar, in pollinemj 

 albifTimumconcufi , aSoIaribus radiisinlridem albamfran- 

 guncur &efFormancur. Crura hujus Iridis folenc efle crafilo- 

 raverfoscerram , quoniamvapores , nebula^que ad cerram 

 graffiores cunc exiftere fol^nt , quam fupra in fublimi aere , ubi 

 obhanccaufamarcusperquam obfcure cernicur, iaivis peri- 

 porum Machemacigorum judidis. 



OB 



