jE ^S, Dana — Chondrodite from the Tilly-Foster Iron Jline. 89 



of the very simple crystals of the 2d type (see fig. 4 and page 18). 

 There are present also at one extremity it ^'(t"^^^'^^''^)? though the plane 

 could only be approximately measured. This is probably also to be 

 explained as having resulted from a revolution parallel to the basal 

 plane. The crystal was very small and not at all adapted to expei*i- 

 mcnts having in view the discovery of any proper hemimorphic 

 developiuent. The angles measured on both these crystals are con- 

 tained in the following tables. 



Table XII. 



Unfortunately the inclination to C on no one of the pyramidal planes 

 could be measured with perfect accuracy ; the measurements are good, 

 yet not entirely trustworthy. These planes, though brilliant, are uni- 

 formly fi-actured in the manner already explained, and this made all 



Tbans. Conn. Acad., Vol. III. 12 July, 1875. 



