500 GEOLOGICAL REMARltS, &^C. 



calc-spar : the smaller veins approach to basalt, 

 with olivine and aiigite. Other varieties are inter- 

 mediate between basalt and clinkstone ; and con- 

 tain small portions of blackish-coloured clay, to- 

 gether with calc-spar, crystals of felspar, and little 

 shining facettes of hornblende. 



The examination of the Cartlane Craig, will al- 

 ways interest the mineralogist ; and the fatigues 

 of Mr LiGHTFOOT, in clambering over its broken 

 rocks, were rewarded by the discovery of several 

 rare and curious plants. 



