results of the measurements on two crystals are given in detail 
with them, for purposes of comparison, the calculated results Lo 
NN symbols deduced. If we consider the pyramids as of the second 
ES: the prism becomes the prism of the first order. All the formas observe 
¿FAA here are already well known, the complete list being as follows: —(0001), dede 
MN (1010), (1128), (1122), (2941). , 8 
The accompanyng drawing, was prepared from a gnomonic projes- - 
tion showing the projection points of the normals of an idealized JN 
representing all the forms obtained. The relative central distance for the 
different forms indicated in the drawing corresponds very closely with 
that of the crystal examined. 
Hematite crystals showing the prismatic habit have been dota 
by Pirsson * His apecimens were also obtained from Mexico and were 
peculiar in their association with cassiterite, which was frequently cont- 
ained in the hematite as inclusions. Some of the Guanajuato crystals were 
finely powdered and treated with hot concentrated hydrochloric acid: the 
resulting solution was tested in the usual method and was found to be 
free from tin. ¡e 
These observations were made in the Mineralogical Laboratory of 3 
the University of Toronto. » . 
December, 1903, s 
CRYSTAL N? L 
Measured. Calculated. 
No Symbol 
: 5 o 3 p . 
1 po AA po 510 (0001) 
2 909 09 15 909 105 8 
3 900 po 2 900 po . 
4 909 00 8 909 (1010) 
5 900 00 15 909 
6 900 09 10 909 
7 909 00 8 909 
8 720 214 290 59% 720 22 
9 380 36" 28 Y 380 11" 
10 379 15 270 46' 380 11' 
11 380 24 300 25 380 11 
12 379 15" 309 40" 380 11' 
13 400 6 280 55 380 11 
* Journal; vol. 42, p. 407. 1891. 
