204 J. P. Cooke, Jr., on some American Chlorites. 
ehlore, while in other cases these two heteromorphous minerals 
clea cide. The 
erystals of clinochlore thus acquire @ violet tinge and at the same 
time the angle between the optical axes is diminished. Moreove 
the hich 
one side of the field to the other. The successive values ¥ 
have named in. English bongitadi, | etal kasd eirenlat diapertion TO a 2 
the exact equi ts of French words, but they express 
effect of light ' different is, in the first ease forte one. ¢ 
ol to move it laterally, and in the ee 
‘the bisectri | . 
