ARTICLES 89 



favour of the second of the two hypotheses given above, and 

 a good many facts can be adduced to show that extensive soil 

 movements took place towards the end of the Pleistocene 

 period, some time after the Acheulean industry of Swans- 

 combe, Wansunt, etc. Further attention should, however, be 

 directed to these high-level implements, 1 and among other 

 questions to be settled, the proportion of Chellean to Acheulean 

 types might with advantage be ascertained. On the 100 ft. 

 terrace the former preponderate ; but it seems probable that 

 the proportion of the latter may be greater at high levels. If 

 so, does it mean that Acheulean man was more given to wan- 

 dering away from the rivers (beside which he probably lived) 

 than his predecessor ? Or have the implements been swept 

 more than once by violent floods into the terrace gravels, 2 and 

 was there an earlier (Chellean) sweeping more complete than 

 the later (Acheulean) ? The evidence as to the river-level in 

 Acheulean times in France and England also merits further 

 attention. At the close of the Chellean period, as we have 

 seen, the river is said to have descended in France down to the 

 first terrace (30 ft.), and it remained at or but little above that 

 level throughout Acheulean times. In England, on the other 

 hand, there is at present no evidence to show that it ever 

 left the 100 ft. terrace throughout Chellean times, or even 

 perhaps before the close of the Acheulean period ; for there 

 is certainly no definite connection between the latter industry 

 and the 50 ft. terrace of the Thames. Mention, however, must 

 be made of certain extremely scarce implements obtained 

 at Farnham from a level which should probably be regarded as 

 little if at all above the flood plain of the Thames. Though 

 occurring deep down in, if not below the gravel, they are 

 entirely unabraded, but while they would usually be referred 

 to St. Acheul II., they differ markedly from the specimens 

 of that type found 80 ft. higher up in the same valley, in that 

 they are nearly all made of black or blue-black flint, which, 

 not being a normal constituent of these gravels, suggests 

 special quarrying. They often show also a difference in edge- 

 clipping, and it is quite possible that they should be referred to 

 the Mousterian period ; otherwise we must admit a recrud- 



1 See Mr. R. A. Smith's paper, Proc. Prehist. Soc. E. Anglia, vol. ii. pt. iii. 

 P- 392. 



* Ibid. vol. i. p. 62. 



