580 Geological Society. 
into six sections: — (1) The consequent river cutting the Chalk at 
Guildford ; (2) the subsequent stream coming in from the east at 
Shalford ; (3) the western subsequent stream parallel to the Hog's 
Back ; (4) the continuation of the last westward (the Tilford River), 
rising at Selborne and receiving many tributaries, including the 
Headley River, from between Blackdown and Hindhead : (5) the 
short obsequent section from Farnham to Tilford (the Waverley 
River) ; and (6) the portion above Farnham coming from Alton and 
beyond (the Farnham River). Part I deals with the relation of 
sections 6, 5, & 4 to the Blackwater. It is assumed that there 
was a consequent river coming down from Hindhead, flowing north- 
wards along the ' Waverley River,' and joined by the Farnham, 
Tilford, and Seale rivers. This seems to have been the original 
head of the Blackwater. But subsequently capture took place by 
section 3 of the Wey, with the result that the Tilford River passed 
into the "Wey basin, and section 5 was thus beheaded. The de- 
velopment of an obsequent stream near the course of the last 
eventually tapped the Farnham River, but not the Seale. 
Part II deals with the Palaeolithic Gravels of Farnham. Their 
height and distribution is discussed, with a view of determining the 
river which originated the gravels. The ridges constituted by the 
gravel drop to a lower platform along the Waverley River : this is 
regarded as the left bank of the consequent valley before that was 
beheaded. If this were the case, the gravel would have been formed 
by the Farnham River while still tributary to the Blackwater. At 
this time, too, probably the Headley tributary drained into the 
Farnham, and not the Tilford River, giving rise to the south-western 
portion of Alice Holt. 
Part III deals with the Farnham branch of the Wey and the 
Alton district, which is remarkable in that there is a complicated 
series of Chalk- valleys, which spread over some 50 square miles of 
country and discharge their waters into the Weal den area. One 
possible explanation is that this portion originally drained into the 
Whitewater over the present col of Golden Pot. In discussing this 
explanation, it appears that the Tisted tributary has the characters 
of a consequent stream; but there is no very good evidence, except 
alignment, of the former connexion of the two basins. On the 
other hand, the Farnham River rather appears to have originated 
in a Chalk-surface than in Wealden beds; and thus it and its 
tributaries may have been developed on the Chalk portion of the 
peneplain of the Weald. Thus the Farnham stream appears to 
present a case of the conversion of a Chalk-valley into a Wealden 
one in its lower part, while in the Caker stream the reverse is the 
case, and it is the upper part of the stream that has entered 
Wealden beds. 
