194 ON A NATURAL SYSTEM 



in water, more readily acquire a fubtilety and free- 

 dom of their particles, which, through the means 

 of attraction, is necefliiry to form them into cry- 

 flalline concretions; but t!ii> property is not limit- 

 ed to them, as crytialline fulfils are found in aU' 

 moil every genus of earths, metallic, and phlogif- 

 tic fubflunccs., 



$ CLXXVII. -External Markt taken from the 

 Texture -of FoJJUs. 



THE texture of fofiils is not eafily determined 

 by the form of the particles ; as when they arc 

 intimately combined with each other they are 

 always mutilated by fractures ; we may, how- 

 ever, dillinguifh many varieties. The molt fub- 

 tile;ihapelefs molecules ulually called impalpable, 

 give rife Lo an equal texture : while others larg- 

 er, and more dilccrnablc produce a granous, fi- 

 lamentous, fcaly, and fpataceous competition, 



5 CLXXVIII, From the Colour. 



COLOURS, efpccially the gradual fhades ol 

 them, can fcarcc be fo defcribi-d l>y language, 

 as to convey any clear idea, Hardly any other 

 method, therefore, than that of companion can 

 be uied by always referring to thofe colours Juf- 

 ficiently undcrflood. 



CLXXIX. 



