5 6 Mifcellanea Curio fa. 



But in the Ratio's between thefe (fuch as We 

 have in all Fluids known to us, except the 

 Air) by how much the greater is the Ratio, 

 by fo much is the Iris more diHant from the 

 Point oppofite to the Sun, or rather from the 

 Sun it felf, reckoning the Arch beyond a 

 Semicircle. And confequently the Colours 

 will feem to be in a different order from the 

 Primary Iris, in thefe returnings, unlefs the 

 diftance of the Irides from the Sun, be taken 

 in this Seme which is alfo every where to be 

 obferved in the reft. 



The Third Iris is confufed in the part op- 

 pofite to the Sun, the Ratio of the Refra&ion 

 being as i 10,91855 — from thence it re- 

 turns back to the Sun in the Ratio of 1 to 

 ,68250--- whence again, the order of the 

 Colours being reftored,in the Ratio of 4 to 1, 

 or CA to C e, it terminates in the part oppo- 

 fite to the Sun. The Fourth Iris beginning 

 from the Sun, in a Ratio of Equality, pafTes 

 on to the oppofite Point, in the Ratio of 1 to 

 ,94895 — and thence returns back to the Sun, 

 if the Proportion be as 5 to 4-, hence again, 

 it difperfes to the Point oppofite to the Sun 

 in the Ratio of 1 to ,56337 within which 

 compafs are included the Refractions of all 

 Fluids that are known. Laftly, The Ratio 

 being as 5 to t, or CA to Cn, it vanifhes in 

 the very Sun it felf-, the Colours being every 

 where inverted to the fight in its return to 

 the Sun, as the^ were ere'tl in its egrefs from 

 it. Hence, in watery Clouds, the Firfi and 

 Fourth Iris fhew deep red Colours turned to- 

 wards the Sun ; but the Second and Third give 

 Purple. But perhaps I may feem too tedious 



in 



