PLATE m. 
DESCEIPTIONS. 
Fig. 1. 
Felsimr-rich Norite. 
Slide 467. 
Magnification 6 6. 
Ordinary light. 
Sp. gr. 2-91. 
bytownite. 
diopside. 
enstatite. 
Fig. 2. 
Felspar-rich Norite. 
Slide 76. 
Magnification 6"6. 
Polarized light. 
Sp. gr. 2-87. 
Fig. 3. 
Poikilitic felspar-rich Gahbro. 
Slide 420. 
Magnification 14. 
Ordinary light. 
Minerals : bytownite. 
diopside (poikilitic). 
Sp. gr. 2-90. 
Enstatitite. 
Slide 422. 
Magnification 6*6. 
Polarized light. 
Minerals : enstatite. 
interstitial labradorite. 
Sp. gr. 3-30. 
Fig. 5. 
Felspathic Enstatitite . 
Slide 71. 
Magnification 6 6. 
Polarized light. 
Minerals : enstatite. 
bytownite. 
diopside (interstitial), 
micrographie quartz and 
felspar (in SW. corner). 
Fig. 6. 
Felspatliic Websterite. 
Slide 475. 
Magnification 6 6. 
Polarized light. 
Minerals : enstatite. 
two monoclinic pyroxenes 
(a large diopside in E. field), 
bytownite. 
Sp. gr. 3-22. 
