ADVERTISEMENT. This treatife contains an Explanation of the Ex* ternal Characters of Minerals and of the language which I have employed in the two firfl: volumes of my Syftem of Mineralogy. The prefixed Ta bular View I received from Werner, and pub- lifhed fome time ago*, but now incorporate it / in this treatife, with the addition of the corref- ponding terms in German, French, and Latin. The doctrine of Oryflometry, of which Hauy has given fo interefting an account in his Treatife on Mineralogy, will be fully illuftrated in a fub* fequent work. Roslis, November 20, i8oy» * Tabular V^ew of the External Characters of Minerals, * y/ for the use of students of Oryctognosy. 8vo. JS04.