AND tiriir.K wouK IN iii;rts. 117 



from innldiip: two quotations from it. Wc are told that, " Owinp; 

 to local irroiiiilaritios, tlu> London (day may rest dirootly on tho 

 chalk." I can only say that I have novor seen such a thing, or 

 hoard of any evidence of it. 



"The New River Company has captured the whole of the 

 Chadwell sin-inp:, which rises from the chalk at Amwell, near 

 Hertford. The flow of this spring- is very variable, acoordinp; to 

 seasons of drought, which seems to show tliat the bulk of the 

 water comes from but little depth from within the chalk." This 

 topographical information is decidedly new, and the inference as to 

 the water is debatable. The writer accepts Mr. Middleton's view 

 that the water-level has not been affected by wells. 



Quite lately Mr. H. W. Monckton has published a paper "On 

 a Section in the Westleton Beds at Ayot Brickfield," * in which he 

 describes a stratified sandy gravel mainly composed of flint-pebbles, 

 but with many subangular flints and quartz-pebbles, and with some 

 pebbles of quartzite. The chief interest of the section is the way 

 in which the Boulder Clay cuts through the gravel, until, on the 

 south, it rests on the London Clay. The Westleton Beds, be it 

 remarked, are of Pre-Glacial age. Whether this particular gravel 

 should be thus classed I am not prepared to say, not having been 

 to Ayot for many years. The section was seen during an excursion 

 of oiu' Society and of the Geologists' Association last year. 



There has lately appeared a Drift Edition of Sheet 46, S.E. of 

 the Geological Survey Map, the greater part of which is concerned 

 with our county, from the neighbourhood of Markyate Street on the 

 west, to Bennington and part of Hertford on the east, and fi'oni 

 Lnicy, by Stevenage, to Yardley on the north, and to Hatfield on 

 the south. The colours added to this edition cover the greater part 

 of the map, and represent the following six diAdsions ; — River and 

 Yalley Gravel, Loam, Clay with Flints, and three members of the 

 Glacial Drift, namely, Boulder Clay, Loam, and Gravel and Sand. 

 The divisions of the Chalk (Upper, Middle, and Lower) are also 

 shown, with the outcrops of the Chalk Rock and of the Melboum 

 Rock, whilst the Chalk Marl is separated from the rest of the 

 Lower Chalk by the outcrop of the Tottemhoe Stone. This is 

 a valuable addition to the details of Hertfordshire geology. 



It seems to me that one may fairly conclude with a few remarks 

 on the advisability of the process followed in this address being 

 continued and extended. Would it not be well if every year we 



* 'Geol. Mag.,' dec. iv, vol. vi, pp. 59, 60 (1899). See also ' Proc. Geol. 

 Assoc.,' vol. XV, p. 308. 



