TREATISE ON PRIMARY GEOLOGY; BEING AN EXAMINATION, BOTH PRACTICAL AND THEORETICAL, OF THE OLDER FORMATIONS. BY HENRY S. BOASE, M.D. SECRETARY OF THE ROYAL GEOLOGICAL SOCIETY OF CORNWALL, &c. &c. LONDON: riUNTED FOR LONGMAN, REES, ORME, BROWN, GREEN, & LONGMAN, PATERNOSTER-ROW. 1834.