t- 
n-yfi 
OCTOBER.] 
Price Is. 
[1891. 
TRANSACTIONS 
OF THE 
HERTFORDSHIRE 
NATURAL HISTORY SOCIETY 
AND 
FIELD CLUB 
EDITED BY JOHN HOPEINSON, F.L.S., F.O.S. 
VOL. VI. PART 5. 
CONTENTS : 
IS. Water and Water-supply, with special reference to the Supply of London 
from the Chalk of Hertfordshire. By John Hopkinson, F.L.S., F.G.S., 
F.R.Met.Soc., President. Plate 1Y. 129 
LONDON: 
GURNEY & JACKSON, Successors to VAN VOORST, PATERNOSTER ROW. 
HERTFORD: 
STEPHEN AUSTIN AND SONS, PRINTERS, FORE STREET. 
( K /• iROlvd.' i\Y ,; 
ft ' V. ' ■' V- 1 .'',y }' 
1891 
