OVERLYING ROCKS. 517 



enumeration would here serve no purpose but to 

 swell a list already perhaps too long. 



B. Felspar crystals imbedded in a base of syenite. 

 This variety admits of the same remarks ; and 



the porphyries of this character, which are gene- 

 rally connected with the more antient rocks, are 

 often not to be distinguished from porphyritic 

 granites, into which they pass. 



C. The crystals consisting of felspar and quartz. 



D. The crystals consisting of felspar and mica. 



E. The crystals consisting of felspar and talc. 



F. The crystals consisting of felspar and epidote. 



G. The crystals consisting of felspar and pinite. 

 H. The crystals consisting of felspar and chlorite. 



In the only example of this last variety which 

 I know, the compact felspar that forms the base 

 is of a green colour, and the imbedded felspar 

 has also in most parts the same hue. It occurs 

 near Campbelltown. 



I. The crystals consisting of felspar and horn- 

 blende. 



In all these cases, as in former ones, either 

 variety of felspar may form the imbedded crystals ; 

 jiamely, the common, or the glassy, or both 

 together. 



