CONTENTS AND ILLUSTRATTONS. 7 
Page 
Fig. 15. Spokane Bar sapphire deposits, Lewis and Clark County, Mont 108 
16. Sapphire crystals from Missouri River bars, Montana 109 
17. Map showing location of sapphire mines, Yogo district, Montana _. 112 
18. Map of the peridotite formations at Corundum Hill, Macon 
County, N. C 117 
19. Map of the peridotite areas in the vicinity of Sapphire, Jackson 
County, N. C, showing the location of the different corundum 
mines 124 
20. Corundum crystal from near Marshall, Madison County, N. C 126 
21. Map of peridotite formation at Laurel Creek, Rabun County, Ga .- 129 
22. Map showing location of emery deposit at Chester, Mass 185 
23. Ooss section of the Old mine, Chester, Mass., showing quantity of 
emery taken out to April, 1899 136 
24. Map showing location of the corundum-bearing rocks of Ontario - _ 152 
25. Emery and corundum wheels and stones adapted for all kinds of 
abrasive work 165 
26. Dental points, wheels, etc. , made of corundum 166 
