260 HISTORY OF MINERALOGY. 



for geometrical relations. However this may be, 

 the glory of giving to crystallography its just im- 

 portance in mineralogy is due to France ; and the 

 Treatise of Haiiy, published in 1801, is the basis of 

 the best succeeding works of mineralogy. In this 

 work, the arrangement is professedly chemical ; and 

 the classification thus established is employed as 

 the means of enunciating crystallographic and other 

 properties. " The principal object of this Treatise," 

 says the author 7 , "is the exposition and develope- 

 ment of a method founded on certain principles, 

 which may serve as a frame-work for all the know- 

 ledge which mineralogy can supply, aided by the 

 different sciences which can join hands with her and 

 march on the same line." It is worthy of notice, as 

 characteristic of this period of mixed systems, that 

 the classification of Haiiy, though founded on prin- 

 ciples so different from the Wernerian ones, deviates 

 little from it in the general character of the divi- 

 sions. Thus, the first Order of the first Class of 

 Haiiy is Acidiferous Earthy Substances; the first 

 genus is Lime; the species are, Carbonate of Lime, 

 Phosphate of Lime, Fluate of Lime 9 Sulphate of 

 Lime, and so on. 



Other Systems. Such mixed methods were in- 

 troduced also into this country, and have prevailed, 

 we may say, up to the present time. The Minera- 

 logy of William Phillips, which was published in 

 1824, and which was an extraordinary treasure of 



7 Disc. Prel. p. xvii. 



