AS RELATED TO INTELLECT. 29 



disguise so as to discover the thirteen fundamental 

 forms from which all others can be derived, and of 

 which they are modifications. As an example of 

 these modifications, we need mention but a single 

 substance Calcareous Spar, of which Count Brun- 

 non described seven hundred derivative forms. As 

 an aid to mathematical research in reducing these 

 multifarious forms, the light was made to flash the 

 angles by "Wollaston's goniometer ; and when the 

 forms were determined, the same ray searched many 

 of these crystals through, and by the delicate test of 

 its own polarity, acknowledged the truth of the 

 mathematical deductions. Here, then, on a single 

 characteristic of the mineral kingdom, the crystal- 

 line form, have been drawn out the best thoughts of 

 a multitude of laborers among them De Lisle and 

 Haiiy, Phillips and "Wollaston. There is no road to 

 the full richness of the mineral kingdom but the one 

 they have opened. To follow that track, even where 

 they have thrown light upon every place of darkness, 

 and placed finger-boards at every doubtful corner, 

 is one of the most severe and accurate processes of 



discipline to which the mind can be subjected. It 



8* 



