340 A DEEP CHANNEL OF DRIFT IN THE VALLEY OF THE CAM, ESSEX. 



The Author, in reply, maintained that the occurrence of deep 

 Drift at various places along the valley-bottom pointed to the 

 existence of a more or less continuous channel or line of basins with 

 the longer axis along the valley. He had not asserted that the hollow 

 was Preglacial, but that it was either Preglacial or early Glacial. 

 There was no evidence of striated pebbles, which could hardly be 

 expected in the materials brought from a small bore-hole ; still the 

 deposits were of the nature of Glacial accumulations. 



