332 Mr. E. J. Chapman on the Notation of Crystals, 

 Trimetric System, 



E.I.C. 



Weiss and Rose. 



Naumaun. 



li^vy and Dufr^noy. 



P.F. a rectangular 



prism*. 



Griffin. 



P 



M 

 L 

 D 



D^ 



Dm 



A 



mk 



E 



lE 



m 



ntE 

 O 



ho 



mO 

 xOx 



ooa : Oib : c 

 a:<x>b: ooc 



ooa : b : ooe 

 a:b:<x>c 



a 



]■ 

 } 



mb : CDC 

 a :ccb : c 

 : ooA : mc 

 ooa ibic 

 <x>a : b : mc 

 a:b ic 

 :b:mc 

 ma:itb : c 



OP 

 00 Poo 



w 



ooPoo 

 ooP 

 ooPw 

 00 Pn 

 Poo 



jmPoo 



Poo 



jmP» 



p 



jmP 

 mPn 



P 

 M 

 T 



h' 

 A» 

 A- 

 b' 



\_ 



A"" 



t, j', 4'c. 



P 

 M 

 T 



MorT 



P.rM 



P*T 



Pjr My Tz 



Mojioclinic System. 



* If a right rhombic prism be chosen as the primary form, M in the 

 proposed notation will equal A'; L, g'; D, M; D^i A"; D»», g*"; A, a'; 

 E,e'; and 0,b'. 



