ILLUSTRATIONS. 
Page. 
Plate I. Map of a portion of the El Paso quadrangle, showing the Franklin 
Mountains, on the east flank of which the tin deposits lie 11 
Fn;. 1. Cross-section of Franklin Mountains 10 miles north of El Paso, Texas. 12 
2. Section of tin vein exposed in open cut (north vein ) 13 
3. Section of north vein (6 feet acr< »ss) 14 
4. Greisen bowlder in tin vein (shaft on middle vein ) 14 
7 
