INLAND WATER SURVEY 417 
prospects; and this power is increasing with time. Furthermore, the 
geologists become specialists on those areas with which they are best 
acquainted, from having surveyed and studied either the actual rocks in 
question, or their counterparts. 
Questions of water-supply apart, it is incumbent upon the Survey, as it 
always will be, to collect as many records as possible of strata pierced by 
wells, boreholes or shafts, and to secure important rock specimens and 
fossils for study. 
Although much has been done in the past, and more is contemplated for 
the future, it is not claimed that the organisation is as good as it might 
be, and this for two main reasons :— 
(1) The information has chiefly to be acquired (i) by willing acquiescence 
or gratuitous offers on the part of water engineers, well-sinkers, and others 
who appreciate the work that is being done; (ii) by personal relationship 
between them and Survey officers ; or (iii) by the following up of inquiries. 
(2) The work is necessarily limited by the time and energies of the 
staff that can be spared from carrying on the general work of the Survey. 
EXAMPLES OF CONNECTED RECORDS OF WATER LEVELS, ETC., 
PUBLISHED IN GEOLOGICAL SURVEY MEMOIRS. 
Water Supply in Nottinghamshire, 1914.—Contours, at 5-ft. intervals, of 
the water-table in a part of the Bunter Pebble Beds, south of Bawtry and 
west and south-west of Retford (Fig. 1, p. 7). From one series of 
measurements only. The concealed surface of the Pebble Beds is con- 
toured (Plate I). ‘This shows the depth with reference to Ordnance Datum 
at which artesian Bunter waters can be struck beneath impervious Keuper. 
Saffron Walden Memoir, 1932 (Explanation of Sheet 205).—Contours, 
at 25-ft. intervals, of the water-table in the Chalk, for February 1928 and 
June and October 1929 (Plates IV and V). Plotted from measurements 
made by Cambridge geologists under Mr. W. B. R. King, O.B.E., M.A., 
and by officers of the Royal Engineers, under Major R. S. Rait-Kerr, R.E. 
Wells and Springs of Sussex, 1928.—Map and diagrams of the summit 
of the water-table in the South Downs, near Brighton, by Mr. A. B. 
Cathcart, M.Inst.C.E. (Fig. 5); and graphs showing the relationship of 
water-level in a well at Broadwater, Worthing, to rainfall from drawings 
by Mr. F. Roberts, M.Inst.C.E. (Fig. 6). 
Records of London Wells, 1913.—Contours of the underground water 
surface at various dates (Fig. 2), and a coloured map of underground 
water-levels at 25-ft. intervals (Plate I). Also a diagram showing difference 
in amount of bourne-flow water passing Kenley and Purley gauges (Fig. 4), 
and a map of the London districts showing contours of the pre-Tertiary 
Chalk surface. 
APPENDIX E (a). 
WATER LEVEL IN THE CHALK AT COMPTON, 
W. SUSSEX. 
By D. Hatton THomsOoN. 
Measured in well at Compton House, Compton. Ground 
level, 266 ft. O.D. Depth of well, 180 ft. Recorded water 
level varies between 220 and 94 ft.O.D. No pumping. 
The saturation level in the chalk emerges at ground level at varying 
points lower down the valley up to a distance of 44 miles from Compton, 
