276 



PHYSIOGRAPHY. 



Idocrase. 



Secondary forms. 



Worcester, (Mass.) 



Fig. 257. 



M 



Jtt 



Amity, (N.Y.) 

 Fig. 258. Fig. 259. 



Vesuvius. 



Vesuvius. Norway. 



Fig. 255. Primary form, with the lateral edges trunca- 

 ted. M on d=135. (perioctaedre. H.) Fig. 256. The 

 same, having the terminal edges truncated. P on c =142 

 54'. (unibinaire. H.) Fig. 257. M on h = 15327 / , 

 don A = 161 33 7 . s on 5 = 148 24'. c on 5 = 150 31'. 

 M on 5 = 144 44'. (isomeride. H.) Fig. 258. P on n = 



152 58 7 . P on = 151 52'. c on o = 154 45'. M on o 



