MT. 88.] TERTIARY MEMOIRS. 79 



ditions which determine the Relative Value of the 

 Water-bearing Strata of the Tertiary and Cretaceous 

 Series, and on the Probability of finding in the Lower- 

 Members of the latter, beneath London, Fresh and 

 Large Sources of Water Supply." His opinion, how- 

 ever, which was confirmed by the experience of later 

 years, was that the growing needs of London would 

 necessitate in the future) an ampler supply, for which 

 tho far-off mountains of Wales might be the best 

 source. 



Boforo tho publication of his book on * The Water- 

 bearing Strata,' tho first of three important rnomoirs 

 which will ovor bo associated with his namo was read 

 at tho Geological Society " On tho Structure of the 

 Strata between tho London Clay and tho Chalk in the 

 London and Eampshire Tertiary Systems. Part I., 

 Tho BaHomont H<*1 of tho London Clay, 1850." This 

 papor is illustrated by twenty admirable sections, and 

 a tablo is givon showing tho goneral range and dis- 

 tribution of tho organic remains of tho basement bod 



o 



of tho London Cl ay through tho Hampshire and Lon- 

 don Tertiary districts. The lino of range is taken from 

 tho IH!O of Wight north to Hungerford, thence east to 

 Homo Hay. 



Thoso three papers were the outcome of years of 

 caroful research : thoy defined the boundaries of indi- 

 vidual bods which had not previously been discrimin- 

 ated, or had boon confused with each other, and the 

 relations of tho Tertiary strata in the .London and 

 Hampshire basins woro demonstrated. 



It, IIRH boon pointed out by Mr II. B. Woodward 1 

 that Prestwich, commencing in the London area, 

 zealously traversed tho country wherever the Lower 



1 Natural Scionce, Au#. 189(5, p. i)l. 



