TRANSACTIONS OP SECTION K. 



835 



South Afrlcft are in close association with houlder-beds of considerahle extent. 

 In some places, as for example in India and Australia, the boulder-heds rest on 

 rocks bearing unmistakable signs of the grinding action of ice. There can be no 

 reasonable doubt that the huge continental area of which India, South Africa, 



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parts of South America, and Australia remain as comparatively insignificant rem- 

 nants, was exposed to climatal conditions favourable to the accumulation of snow 

 and to the formation of glaciers. One possible explanation, therefore, of the exist- 

 ence of a distinct vegetation in the southern area is that the climate was such as to 

 render impossible the existence of those coal-forest plants that exhibited so vigorous 



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