504 



MEASUREMENTS OF CRYSTALS. 



TOURMALINE. Figs. 35G to 373 inclusive. Page 

 356. 

 Fig. 356. The primary, an obtuse rhom- 

 boliedron. 



PonP 133026' 



Fig. 357, et seq. 



PonJt 152051' 



Pon/ in 9 



P on« 156 43 



P ono 141 40 



Pons 113 13 



TOURMALINE. 



konl 90° 0' 



/cons 90 



I onl 120 



I ono 135 44 



I ons 150 



n on n - 155 9 



n on s > 102 26 



ono 103 20 



sons - 120 



