JST. 47.] SEQUENCE OF DRIFTS. 135 



nearly perfect. The most important part of the hinge remains, 

 viz., that part showing striations. Morris has seen it, and there 

 can, I think, be little doubt of it. It is about the size of the one 

 from Shacklewell. I found 1 Purpura lapillus, 4 Littorina 

 littorea, 1 Buccinum, 3 Tellina, 1 Cardium. These shells are 

 scarce and uncertain. On my second visit, although two deep 

 trenches were dug, not one marine specimen was obtained. My 

 first trench went down to the hard conglomerate rock 3 or 4 

 feet beneath the flints. 



I saw Drucat on my last visit and was much interested with 

 the section. M. Boucher de Perthes gave me a flint implement 

 from that locality. . . . 



I have often seen the loess, both in France and Belgium, on 

 different levels. A good exhibition of this occurs at St Peter's 

 Mount, Maestricht. I don't believe in the faults. 



With regard to the age of the Eed Clay Drift with meulieres 

 around Paris, I am perfectly satisfied in my own mind that 

 it is older than the drift of the valleys with land and fresh-water 

 shells, bones, and granite, and that the valleys were excavated 

 after the spread of the up-level Eed Clay Drift. 



I missed Chartres on my last visit to France. I was going 

 there, but waiting for some of my companions from England (who 

 never came), I was detained in Paris until too late in the day. 

 It is a place well worth visiting, as are also the others you name. 



I am inclined to think Moulin Quignon older than Menche- 

 court. I would not, however, assert that opinion. So I think St 

 Acheul older than St Eoch. This is in physical evidence, but 

 the other evidence is so curious that I must again go over the 

 ground and examine all the collateral facts before venturing at a 

 conclusion. I should not be surprised at all proving of the same 

 age, or nearly so. 



I shall certainly go [to] Boves, and will write to M. Pinsard. 

 I also saw one very white flint implement (in M. Boucher de 

 Perthes' collection) with red clay adhering to it. It was from 

 St Eiquier. I do not remember one (white) with ochre, sand, or 

 earth. 



I am going out of town this afternoon for a day or two, and 

 next week I start for Wales, but I doubt whether I shall be 

 at Aberdeen. I shall be very glad, therefore, of a few lines 



