42 



GEOLOGY OF THE CAMPSIE HILLS, 



Other ; although, however, there was no very 

 striking similarity to be observed among them, 

 they were all angular, and their forms generally 

 consisted of four, five, and six sides. They were 

 perfectly vertical in position, and their forms were 

 to be traced nearly down to the stream which had 

 invaded their situation. Upon examining the 

 surface which the lake had formerly covered, I 

 found it perfectly level, and divided into polygonal 

 forms by fissures and cracks, stretching out in all 

 directions, which, by intersection, formed the 

 columns here described ; on the tops of which, I 

 stepped from column to column, as upon a Giant's 

 Causeway. Some of the cracks and fissures had[ 

 been here filled up with dust of a blackish-brown 

 colour, which gave some parts of this surface the 

 appearance of mosaic work. The majority of 

 the tops of the columns were certainly very irre- 

 gular as to form, yet there were some among them 

 that could be perceived approaching very nearly 

 to regularity in sides and angles : two of these 

 particularly attracted my attention, and which I 

 found almost bore the test of measurement. 

 These two were pentagons ; the one was two feet, 

 and the other a foot and a half in diameter. 

 The muddy clay of which the whole of these 

 columns were composed, was almost of an im- 

 palpable grain, and was of a reddish-brown co- 

 lour ; it had gained a considerable induration in 



