﻿288 Intelligence and Miscellaneous Articles. 



provided the water-supply. In early days the City was dependent 

 on many wells sunk through the gravel, some of which were famous, 

 such as Clerkenwell, Holywell, and St. Clement's. In the same 

 way the outlying hamlets (for instance, Putney, Roehampton, 

 Clapham, Brixton, Ealing, Acton, Paddington, Kensington, 

 Islington, etc.) started on the gravel, but later outgrew it, as 

 pointed out by Prestwich in his Presidential Address of 1873. In 

 the City the supply soon became inadequate, or as Stow says 

 ' decayed,' and sundry means were adopted to supplement it. The 

 conduit system, bringing water in pipes from distant springs, began 

 in 1236 ; London-Bridge Waterworks pumped water from the 

 Thames by water-wheels from 1582 to 1817 ; the New River was 

 constructed in 1613, and is still in use. It was not until the 

 19th century that steam-pumps and iron pipes made it possible 

 for the clay area to be occupied, thus linking together the various 

 hamlets that are now the Metropolitan Boroughs. 



Some of the ways in which Geology affects London to-day were 

 briefly indicated, and the lecture was illustrated by a number of 

 lantern-slides, reproduced mainly from old maps and prints. 



XXIV. Intelligence and Miscellaneous Articles. 

 young's modulus and poisson's eatio for spruce. 



To the Editors of the Philosophical Magazine. 

 Dear Sirs, — 

 IN my recent paper in the Philosophical Magazine for May 1922 

 -*- there is an error on page 877. It is there stated that 



G"yz Gzy G"zx °~xz °~xy Gyx 



TP ' TH TH 5 XT* T? 



y ih z Jh z & x \h x Jbjy 



S 

 are equal respectively to 700 S«, 700 S^ and ~ . 



£>x 



This should read 



E z _ Ojy E^ _ OjX Ea; _ Gjy 



Ey (TyS E z <T X z Ey (T yX 



S 

 are equal respectively to 700 S«, 700 8 X and ~. 



The error becomes evident on reading the paper, but I xery 

 much regret that it has crept in. 



Tours faithfully, 

 The College of Technology, " H# CABBiwcwxMr. 



Manchester. 



May 24th, 1922. 



