138 



Garnets vary much in size. I have one, with which I 

 was favoured by Lady Wilson, from Scotland, above an 

 inch in diameter, and they are sometimes larger ; perhaps 

 they may be found equal to those from Fahlun in Sweden, 

 which I have seen very large ; and I have one, a rhomboi- 

 dal dodecaedron, nearly five inches in diameter. 



These specimens, with their gangues, will be doubly 

 useful when we come to treat of the Rocks. 



