78 WATER-SUPPLY. |inr,o. 



ami will toll you what the genera are which I have referred 

 to above ; and your papa will bo able to assist you in deciphering 

 my hieroglyphics in case you are at a loss in any part <>!' this 

 letter, which I urn writing as usual in a hurry, The Himly, my 



<|r;ir Soph in. n I' I lit- <> nl.jrrl,",, ::in;ill a : lli.'y MIT, i:; I'll II of i literal 



As they tiro tlnm kept in tho propnr ohmient, you will he nhlc 

 to watch nil tluM-hnn^cH win. h I..K-- place in (Jinn. Kvcry <luy 

 will ;i.llnrd IVi'Mli pointM for <>l>Mrrvnl ion, .md I he mm.- you sec \.\\u 

 more you will, I think, wish to loarn, so beautiful are the objects 

 and so wonderful is their variety. Once started, there is no 

 trouble at nil. Keep tho jar in a light place, with occasional 

 HunHhino upon it. 1 have annexed a rough sketch of the jar, 

 so as to indicate its form and general appearance to assist you 

 in getting it up. Trusting that it may prove to you, my dear 

 Sophia, a source of pleasant and profitable recreation in your 

 close confinement, I remain, your very affecte. uncle, 



J. PKKSTWIOH, Jr. 



One of the special subjects to which for some time 

 Prestwich had turned his attention was the question 

 of water-supply, especially with regard to the service 

 of London. Eventually he became the leading auth- 

 ority on this subject, and furnished many reports to 



public, bodies ;md institutions thai sought lis advice. 

 In later years be occasionally received in<|uiries from 

 private individuals, who only knew him by reputation, 

 asking him to point out (lie best situation in \vliich 

 to build a country house (giving the range of a, low 



cou nl ie;;), ;;<> ;is |o ensure a i^ood \va(er supply. Tho 

 request of a. si ranker writing for information about 

 tho elfects of sea waler on blocks of maj.;-nelic iron ore 

 rernxed immediate attention. 



His first public address on the water-supply of 

 London was jjfivon at tho Royal Institute of llritish 

 Architects, Sth July I S..O, and was published in its 

 Proceedings. Its title was, "On the (Jeoloincal Con- 



