Mineralogy, according to the Principles of Professor MOHS. 313 



Chrysolite, and other species that have long ago been observed 

 in nature, will no doubt lead to brilliant discoveries. It is to be 

 expected that, the more we are capable of multiplying the points 

 of comparison between the natural-historical properties and the 

 chemical constitution of minerals, the more we shall find them 

 to tend towards harmony in their results ; but the correct deter- 

 mination of the mineral species, according to those properties 

 which it must always possess, in its unaltered and permanent 

 state, can alone guard us from stooping to empirical laws, when 

 it is practicable to arrive at results as direct as geometrical de- 

 monstrations, and not inferior in evidence. 



