282 THE GEOLOGIST. 



in the newly quarried body of the same rock of the Cors- 

 torphine Hills, and at various levels, undulations, and 

 grooves precisely similar to those on the surface, which were 

 then shown to belong to original structure. He (the Pre- 

 sident) was opposed to the terrestial glacier theory of 

 Agassiz, as applied by that naturalist, and Dr. Buckland, to 

 the low countries of Scotland, over which they contended 

 that glaciers had advanced which had scored all the rocks, 

 and on melting had left moraines of gravel and sand. He 

 believed that, whilst floating ice-bergs most probably pro- 

 duced the striated surface, the wavy undulations are une- 

 quivocally due to the original structure of the rock. 



Dr. Buckland stated, that he had examined the valleys of Snowdota 

 subsequently to Mr. Bowman's visit to that district, and had observed 

 phenomena which he considered to afford decided confirmation of the 

 glacial theory. 



Sir H. T. De la Beche observed, that the views advanced by the 

 advocates of the glacial theory were probably true to a certain extent, as 

 when applied to Wales and Cumberland, but if extended further, they 

 only would lead to physical impossibilities. 



Professor Johnston made a brief verbal summary of the 

 second part of his Report on Chemical Geology. 



In this communication, which was confined to the igneous 

 rocks, there were three principal points to which the author 

 wished to direct attention, the nature and chemical com- 

 position of these rocks, their immediate source, and the 

 effects they produced upon other rocks. He stated, that 

 all geologists were now agreed that these rocks had been 

 originally in a state of fusion, and portruded from the earth 

 in a liquid form ; this had taken place in several different 

 ways : sometimes they appeared as if forced up through the 

 stratified rocks, and remaining amongst them at various 

 angles ; at other times they overlay the stratified rocks, or 



