402 



PROFESSOR HUGHES 



were found running to a depth of 40 feet 6 inches from the 

 surface of the Paddocks as they then were, that is before they 

 were raised. The Bench Mark on the stone at the south-west 

 corner of the iron bridge between Trinity College and St John's 

 College indicates 22 feet 9 inches above O.D. The deepest of 

 the old channels then determined is therefore 20 feet 9 inches 

 below O.D., allowing 3 feet for the height of the Bench Mark 

 above the original level of the Paddock. In all of these 

 borings alluvial deposits belonging to the present river system 

 extended down to and rested upon the gault (fig. 8). 



Made-up ground. 

 Blue clay and shells. 

 Loam and shells. 



Dark loam and shells. 



Ordnance Datum. 



Fine dark gravel. 



Blue clay and stones. 



Light gravel. 

 Blue clay. 



2' 6" 

 3' 9" 

 4'0" 



7' 3" 



12' 0" 



I'O" 



10' 0" 



Fig. 8. Section of bore at south-east corner of south paddock, 

 Trinity College, Cambridge. February, 1893. 



When Mr Bullock dug the hole in which he proposed at 

 one time to construct a swimming bath between the end of 



