280 



PROFESSOR VOWELh ON THE ELLIPTIC POLARIZATION OF LIGHT 



metals at different incidences, and the corresponding ellipticities (s) or tan (y— %). 

 These results give on the whole a view of the changes of ellipticity agreeing with the 

 general appearance of the rings ; though in copper the diminution appears too rapid. 



Table I. 



Table II. 



