72 Crystallographic Examination of Eremite. 
planes é and é replacing respectively the obtuse and acute terminal 
edges; e and e’ each rectangular terminal edge; a and o the obtuse 
or acute solid angles, according as the mark — or ~ is placed over the 
letter; and e,e’ replacing the lateral edges. 
For the determination of the descriptive expressions of the crys- 
tal, (in which I employ Naumann’s system of notation,) the planes 4 
may be assumed as faces of the positive fundamental hemipyramid. 
The following descriptions are thence deduced for the crystals: 
Fig.1. o@Po.aP/o.oP.Po.P.P/0.2P’o. a i ae 
M a ty OR" e’ 
Fig. 2. oP .aP’.amP. oP2.Po.P.2 9P'2. Pe Pa , 
M i ee Sie Se a e’ 
—P.—Po. 
. 6 
Fig. 3. oP .aP’a . Po . 2P2.2P’2. Pm. — 2P’2. —2P2. 
M ss é 7) yy 0/ 0 
—Po é 
€ 
; The angles assumed as the basis of the calculations are as fol- 
ow: 
M : €=140° 40’, M ; €=126° 9’, M : e=136° 35” 
The following are the results obtained by calculation. In some 
instances the angles coincide exactly, in others very nearly, with 
those which I have obtained with the reflective goniometer. 
a:b 3e=9471 31: 1-0265 
7=76° 14’.".M ; T=108° 46 
&= 119° 22/ 0": 0/(over e’)~130°39e/ : 6 =157° 43/ 
= 133° 39/ 0: 6=138° 8’ & ¢ T= 143° 6/ 
A$ 6: M=148° 12 é : T=130° & 
a+ a= 106° 36° 0 } O=129° 58” é : €(adjacent)=93° 12’ 
3: T=121° 6 6:M=141925' = & : d= 1490 41 
a? M=118° 19’ 0 } O(over €) =70°24’ & : HW =130° 3% 
a:a(o overe)=109°54'e P=131° 52° € } a= 143° 18” 
3 = 81° 4 ‘3 P=150°50 er ex 9 98 10 
(8) ° 4) = € : 0 2 € 0 € : oboe 
OPES san KO) 1000 1 name 
pT=121° 18 e: M=) a9 gz, et M=11T° 51" 
‘ O¢ 
%:M=120°10 =e’: M= ; ooo oy et = 1619 16" 
0! : 0 =67° 44’ e e 
o’ : T=111° 2 e € 
03 M=1099 1 es 152956 ee == 155° 2B" 
