Proceedings. xiii 
paper on Percolation Gauges, refers to two that he had made in 
Surrey.* One was on the Chalk Downs and the other in the 
gravel part of Croydon. ‘After about sixteen years he found 
that the vegetation which was natural to the downs had changed 
its character and was putting on a new garment altogether, and 
growing at a very different rate to the rate at which herbage on 
the downs generally grew.” He found that ‘‘more water passed 
through a chalk percolating gauge than actually flowed off a 
chalk area,’ and that ‘the average percolation through a chalk 
gauge was 11:18 inches at Croydon out of a rainfall of 26-08 
inches.” 
1897. 
In this year there appeared a paper of considerable interest to 
Croydon geologists, by W. P. D. Srespine, on “ Boulders of 
Granite from the Middle Chalk of Betchworth, ...’’+ as one of 
the best known occurrences of the sort is that at the Haling pit, 
generally and wrongly called the Purley pit. 
The two stones described came from the zone of Terebratulina 
gracilis, and their weights were 7lb. 7oz. and 3lb. 120z., the 
former being a fine-grained much decomposed rock with valves 
of Spondylus and Serpule attached; the later being of a coarser 
kind, and less decomposed. 
The author thinks that coast-ice was probably the means of 
transport, but allows that in some like cases entanglement in 
the roots of trees may have acted. 
With the conclusion that boulders ‘‘seem to come chiefly 
from the Middle Chalk,” I am hardly disposed to agree, as the 
richest locality I know of is close to the base of the Lower Chalk 
at Gayton, in Western Norfolk, whence I have got many boulders 
of various kinds. 
In the report of an “ Excursion to Redhill and Merstham,”t{ 
a Fuller’s earth pit, near Redhill Station, is noticed, also a 
section of Drift loam over Folkestone Beds at Frenches (see 1899), 
and a sand with phosphatic nodules further north. The new 
railway-cutting near Merstham is described, and then the large 
pit in Middle and Lower Chalk. 
F. Mrzson’s account of an “ Excursion to Woking’’§ deals 
with the Bagshot Beds. ; 
Our member H. A. Martin || alluded to “ Foreign Boulders in 
the Chalk,’’ discussing the method of transport and referring to 
the Haling and to the Betchworth stones. Prof. Bonney objects 
* Trans. Soc. Eng., pp. 170, 171. 
t Quart. Journ. Geol. Soc., vol. liii, pp. 213-220, pl. xv. 
t Proc. Geol. Assoc., vol. xv, pt. 3, pp. 113-115. 
§ Ibid., pt. 5, pp. 185-188. 
|| Geol. Mag., dec. iv, vol. iv, pp. 169, 170. 
