PHYSIOGRAPHY. 



Feldspar. 



19T 



Secondary forms. 



Fig. 183. 



Fig. 184. 



Fig. 185. 



M 



St. Gothard. Rossie, (N.Y.) 



\ 



Fig. 18G. Fig. 187, 



Fig. 188. 



Isere. 



Middlcfield and Becket, (Mass.) 



17* 



