CHARACTERS OF MINERALS. 3 



of minerals there is also (4) that of Descriptive Mineralogy, 

 under which are included descriptions of the mineral species ; 

 and (5) that of Determinative Mineralogy, which gives a 

 systematic review of the methods for determining or distinguish- 

 ing minerals. 



These different branches of the subject are here taken up in 

 the following order • I. Crystallographic Mineralogy ; II. Phys- 

 ical Mineralogy ; III. Chemical Mineralogy ; IV. Descriptive 

 Mineralogy ; V. Determinative Mineralogy. On account of 

 the brief manner in which the subjects are treated in this 

 volume, the heads used for the several parts are, (1) The Crys- 

 tallization of Minerals y (2) Physical Properties of Minerals y 

 (3) Chemical Properties of Minerals y (4) Descriptions of Sp& 

 ties y (5) Determination of Minerals. 



