J. W. BOULTBEE. CLVII. 
their origin from artesian wells at Amwell and Chatfield, 
yielding some 4,500,000 gallons per diem. The Bank of 
England, the fountains in Trafalgar Square, and the House 
of Commons are all supplied by artesian wells, and several 
of the prisons are supplied from the same source. At Sion 
House there isa well 650 feet deep, the water rising 4 feet 
over the curb, sunk in Queen Hlizabeth’s time. Several 
breweries and the Kentish Town Waterworks derive their 
supplies from artesian wells—the latter having a well 900 
feet deep. The London Jute Company havea notable well 
at Ponders End, yielding also a large artesian supply. At 
many places on the southern and eastern coasts artesian 
wells exist, extending as far north as Bourne, in Lincoln- 
shire, where a well 95 feet deep yields a supply under 
sufficient pressure to reach the tallest houses; these are 
known as “ Blow Wells”’ in the locality. The well at 
Bourne was bored through Oolitic strata to a depth of 95 
feet, with a hole of the diameter of 4 inches. Below the 
alluvial a limestone formation 32 feet thick was met with, 
and continued until a stratum of hard rock was met with, 
6 feet thick, upon passing through which the tool suddenly 
dropped 2 feet, and a supply yielding 567,000 gallons per 
diem rose to a height of 40 feet above the curb. Itisa 
notable fact that the great number of wells in the London 
Basin have had the effect of reducing the flow to such an 
extent that wells which were flowing a few years since 
have now to be pumped. 
ALGERIAN BoRES. 
In Algeria and Sahara boring has been practised from 
time immemorial, and of late years immense strides have 
been made by the French engineers, by whom a very large 
number of wells have been put down, with the effect of 
rapidly fertilising and populating portions of this arid region. 
Artesian wells have, as I have said, existed for ages in this 
