MIN5iRAL0GY OF THE PENTLAND HILLS. 201 



ken down, and intermixed together. They are 

 spread over the bottom of the valleys, and sides 

 of the hills : but not in equal quantity, for the 

 gravel and sand are more abundant than tl^t clay. 



III. Peat. 



This wtll known substance, occurs in consider- 

 able abundance in different parts of the district, 

 but does not present any peculiar appearance. 



I hope, on a future occasion, to be able to extend 

 my inquiries to the western portion of the Pent- 

 lands, and to accompany the description of that 

 part of the group with a map of the whole range, 

 and a more particular description than that which 

 I now lay before the Society, of the MidrLothian 

 division. 



