OPTIC AXES IN HARMOTOME AND WOHLERITE. 
571 
which carry the different combinations of forms which I have observed. Eig. 10 is the 
projection upon h l , of a crystal measured by Dauber, regarded by him as orthorhombic 
(Poggendorff’s ‘ Annalen,’ t. xcii. p. 242). The spherical projection (fig. 11) made upon 
the plane of symmetry shows the principal zones in which all the faces are comprised 
that are hitherto known. 
The dimensions of the primitive forms and the calculated inclinations compared with 
the inclinations as directly measured are given in the following Tables. 
b : h : : 1000 : 487,8112 D=687,8636 ^=725,7450 
Plane angle of the base = 86° 56' 17"*8 
Plane angle of the lateral faces . . =103° 50' 37" 
Calculated. 
^ m m 90° 14' in front 
m m 89° 46' on y l 
A 1 Af 164° 7' 
h^g 1 105° 53' 
A 1 A 3 153° 32' 
A'V 11 6° 28' 
*A‘ m 1 35° 7' 
mg' 134° 53' 
< h'g 3 116° 39' 30" 
g 3 g 1 153° 20' 30" 
h'g 2 108° 30' 
161° 30' 
m g 3 adj. l6l° 32' 30" 
mg 3 108° 13' 30" on g 1 
m g- 153° 23' 
g 3 g 2 171° 50' 30" 
A 1 g 1 90° 
^ V A 1 136° 42' 
o' p 152° 33' 
*p A 1 ant. 109° 15' 
, pa 1 adj. 140° 49' 
a} A 1 adj. 1 09° 56' 
pa\ adj. 113° 41' 
a\ A 1 adj. 137° 4' 
< p A 1 post. 70° 45' 
" pe 2 161° 30' 
eV 108° 30' 
p e 1 146° 12' 
e' g 1 123° 48' 
p e\ 126° 45' 
e\g' 143° 15' 
.Pff 1 90° 
Measured. 
90° 3' to 30' (Dx.) a . 
90° approx. (Dx.). 
164° 15' (Dx.). 
153° 29', mean (Dx.); 152° 55' (Dau.) b . 
116° 30' (Dx.); 116° 51' (Dau.). 
135° T, mean (Dau.); 135° 16', mean (Dx.). 
134° 54', mean (Dau.); 134° 59', mean (Dx.). 
11 6° 32', mean (Dx.); 116° 14' (Dau.). 
153° to 153° 20' (Dx.); 153° 30' (Dau.). 
108° 58', mean (Dx.) ; 107° 39' (Dau.). 
l6l° 15' (Dau.). 
l6l° 35' (Dx.). 
108° 40' (Dx.). 
153° 40' (Dx.). 
172° (Dx.). 
90° (Dx.). 
136° 42' (Dx.); 138° (Dau.). 
152° 32' (Dx.). 
109° 15', mean (Dx.) ; 110° 25', mean (Dau.). 
140° 48', mean (Dx.); 140° 15' (Dau.). 
109° 34', mean (Dx.); 108° 45' to 109° 40' (Dau.). 
113° approx. (Dx.). 
138° 35'? (Dau.). 
162° 45' (Dau.). 
145° 35' to 52'; 146° 15' (Dx.) ; 146° 14' (Dau.) 
123° 10'; 50'; 124° 15'; 25' (Dx.) ; 124° 7' (Dau.). 
143° to 143° 10' (Dx.). 
90° (Dx.). 
“ Dx.=Des Cloizeaux. 
b Dau.=Dauber. 
