150 Proceedings of the Royal Society of Edinburgh. [Sess. 
TABLE III. 
64 Groups. 
aj 
80-4 
77-4 
75*8 
74-3 
74-2 
74-2 
74-1 
57-0 
61*6 
64-6 
61-8 
61-5 
57 0 
51-9 
55-6 
1-0 
1-6 
1-4 
1-4 
1-6 
2*0 
1-5 
1-5 
1*7 
1- 5 
2- 1 
1- 7 
2- 0 
1- 4 
2- 3 
1-3 
1-7 
1-2 
1-4 
2*9 
1-3 
11-3 
11-8 
13-2 
13- 7 
13*7 
14- 5 
140 
14- 8 
15- 3 
169 
17-1 
20- 5 
21- 2 
11-6 
14- 9 
12-5 
15*4 
17- 1 
177 
18- 7 
18-8 
164 
15- 1 
17-2 
17-2 
16-1 
153 
159 
215 
142 
15-0 
15-5 
11-8 
11-2 
133 
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1907-8.] Classification of Igneous Rocks. 151 
