A TREATISE ON THE EXTERNAL CHARACTERS OF MINERALS. ROBERT JAMESON, HEOIUS PR0FE880R OF NATURAL HISTORY, AND KEEPER OF THE MUSEUM IN THE UNIVERSITY OF EDINBURGH ; FELLOW OF THE ROYAL AND ANTIQUARIAN SOCIETIES OF EDINBURGU, OF THE L1NNJEAN SOCIETY OF LONDON; HONORARY MEMBER OF THE ROYAL IRISH ACADEMY, OF THE MINE- RALOGICAL AND PHYSICAL SOCIE TIES OF JENA, ETC. OOCX EDINBURGH: JPjfntrt at tfce tHnifcerssttp p?eaa, yea BELL & BRADTUTE, GUTHRIE & TAIT, AND W. BLACKWftUj). AND LONGMAN, HURST, REE3 & ORME, XONDQN.