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232 



MINERALOGY. 



[Sect. VIII. 



have been fc-und to combine either naturally or artificially 

 being only regarded with reference to the general sub- 

 ject, so that the natural bodies, commonly termed 

 minerals, merely constitute a portion of this whole, it is 

 important that the voyager 



be enabled to distinguish 



natural minerals, both as respects science and its appli 



cations. 



The foregoin 



sification 



on 



chemical composition, if he possessed no other means of 

 distinguishing minerals from each other than chemistry 

 afforded him, he would in many instances, from the want 

 of the needful space and appliances on board ship, have 

 the extent of his mineralogical labours greatly abridged. 

 At the sam_e time, with a box containing certain chemical 

 substances, a shght apparatus, and a blowpipe, he will, 

 after a little practice, find his power to distinguish 



anticipate. 



greater 



Postponing for the present the assistance which these 



means of distinguishing minerals chemically, by the wet 



or dry m,ethods, may afford, it may be convenient to refer 

 to the mode of aggregation of the particles of minerals 

 intemally, as also to their external characters, without 



upon those refinements which require the appli- 

 cation of a high order of investigation. For this reason 

 we pass by those properties of minerals which are termed 



enterui 



beautiful and important as they are, and 



so 



valuable with reference to a knowledge of the arrange- 

 ment of the component particles of minerals. So also 

 with regard to their electrical properties and the effects 

 f heat upon them. Should the voyager eventually find 

 mself sufficiently interested in the studv of mineral^, he 



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