THE ORIGIN OF IGNEOUS ROCKS. 
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5. Gabbro (core). 
6. Basalt-glass (breccia). 
7. Gabbro (rich in mica) (core). 
8. Gabbro (rich in mica) (core). 
9. Dioritic facies of gabbro (core). 
10. Poikilitic facies of gabbro (second core). 
11. Augite-porphyrite (Sill). 
12. Porphyrite (hornblende-mica-pyroxene) (dike). 
13. Quartz-diorite-porphyrite (core). 
14. Quartz-mica-diorite (core). 
15. Quartz-mica-diorite-porphyrite (core). 
16. Aplite (dike or vein in core). 
Rocks of Table III. 
Dikes and Surface Flows of Exceptional Character in the Absaroka Range . 
1. Olivine-augite-orthoclase-leucite-rock (dike?). 
2. Basalt (mica and alkali groundmass) (dike). 
3. Basalt (' “ “ “ ) (dike). 
4. Hornblende-minette (?) (dike). 
5. Basalt with alkali-feldspars (flow). 
6. Camptonite (?) (dike). 
7. Minette (dike). 
8. Basalt with alkali-feldspars (flow). 
9. Balsalt (?) (mica and alkali-feldspars) (dike). 
10. Minette (dike). 
11. Basalt (dike). 
12. Leucite-basalt (flow). 
13. Basalt (?) (mica and alkali-feldspars) (dike). 
14. Leucite-basalt (flow). 
15. Basalt (with alkali-plagioclase) (flow). 
16. Mica-augite-andesite (dike). 
17. Basalt (alkali-feldspars) (flow). 
18. Minette (or trachyte) (dike). 
19. Syenite-porphyry (or oligoclase-trachyte) (dike). 
20. Trachyte (glassy), approaching rhyolite (flow). 
Rocks of Table IV. 
From Vesuvius, Rocca Monfina, and Ischia. 
1 to 11. Leucitophyre. Vesuvius. 
12. Trachyte. Ischia. 
13. Trachyte. Rocca Monfina. 
14. Glassy shell of a bomb of leucitophyre. Vesuvius. 
15. Leucitophyre. Rocca Monfina. 
16. Glassy portion of a bomb of leucitophyre. Vesuvius. 
17 to 24. Trachyte. Ischia. (19, obsidian). 
