Volume XII. T'^:!f J'- 



BUIiliETIN 



OF THK 



SCIENTIFIC LABORATORIES 



OP 



DENISON UNIVERSITY. 



EDITED BY 



THOMAS L. WATSON, 



Permanent Secretary Denison Scientific Association. 



THE LEOPARDITE ((QUARTZ PORPHYRY) OF NORTH CAROLINA. 



By THOMAS L. "WATSON 



Granville, Ohio, August, I904. 



