484 
PROFESSOR HENRY A. MIERS: AN ENQUIRY INTO 
faces, and two images in a vertical plane yielded by tlie alternate pair, indicating 
vicinal faces belon ging to a form {hJcO] (fig. 14). 
A and C 
B and D 
Fig. 14. 
Sometimes tlrey are situated obliquely and correspond to two faces of {hJd], 
replacing each cu1)e face. 
The following series will serve as an illustration of the results obtained with this 
substance :— 
November 11, 1897. 
At 12.45 r.M. ; t = 17'6°. 
“A 93° 17'; image 10' 26" below zone. 
B 183° 14'; „ 10'26" „ 
A' 273° 16'; „ 3'42" „ 
B', 3° 14'; „ . . . on 
_B'p 3° 21'; „ . . . 
on 
After slight re-adjustment:— 
At 2.15 r.M., ; t —iN. 
from the upper part of the face. 
,, lower 
All 5' 40" below the cross-wire. 
.-. B' = 3° 18A. 
At 4.15 r.M. ; t — 17°. 
93° 25', 
A^ 93° 24'; image 20' 0" below the cross-wire. 
