JET. 73.] RIVER DRIFT. 325 



uninterruptedly to Vol. IT., nearly half of which is now in 

 type. I am well and about again now, but fear my hand- 

 writing is not improving, to judge from what our friend M. 

 Cornet tells me this morning : " Trois jours m'ont ete necessaire 

 pour lire et bien comprendre votre lettre du 9me a cause de 

 1'imperfection de 1'^criture." . . . 



The excursions during this long vacation were very 

 numerous ; yet they were all confined to those within 

 the day from Darent-Hulme to the ground where flint 

 implements had been found, Mr Harrison frequently 

 joining. He accompanied Professor Prestwich to the 

 Powder Mills, near Green Street Green, to which 

 reference is made in the letter of 17th November. 



J. Prestwich to B. Harrison. DARENT-HULME, 5th August 1885. 



DEAR SIR, I suppose you refer to Vol. IV. of the Geological 

 Mem. by Mr Whitaker. I shall have pleasure in lending it 

 to you. I have recently discovered two new terraces of river 

 drift at 250 and 350 feet in this valley. They may be worth 

 a search on your part. Both are close to Eynsford. I could 

 show you the exact spot on a map. Have you been again to 

 Green Street Green ? and have you got more of the curious 

 siliceous rock of which you left me a specimen ? I must go 

 there some day. Please give rne the exact name of house or 

 farm where the well is. 



To the Same. OXFORD, 17 th November 1885. 



DEAR SIR, I wrote to Messrs Isler & Co. for a section of the 

 well at the Powder Mills. This they sent me, but as it seemed 

 to me insufficient, I wrote for further particulars and specimens. 

 The rock they sent was the ordinary green-coated flint from the 

 top of the chalk. I then sent a specimen of the siliceous stone, 

 and I enclose their reply received this morning. 



I fear there has been some mistake. We saw none of the rock 

 at the Mills, and we got no confirmation of its having been found 

 there. 



