580 MULL. MINERALS. 



adapted for it, as being expressive of its most conspi- 

 cuous feature.* 



* On this substance I shall only remark, as I recently did in treating 

 of Rum, that it is preferable to erect a species, though it should after- 

 wards prove a variety of some known substance, than to neglect the 

 obscure characters which minerals often present. It is to greater 

 accuracy of research and of knowledge that we are indebted for the 

 recent rapid augmentation of the list of minerals. 



