CLVi. ECONOMIC ASPECT OF ARTESIAN BORING IN NS.W. 
numerous brine springs ; the most remarkable of this class 
perhaps, being the Salt Well at Kissengen, in Bavaria, from 
which the water rises from a depth of 1,878 feet toa height 
of 58 feet above the curb. It is alleged that this is due 
rather to carbonic acid gas generated at the junction of 
the limestone and gypsum formation than to hydrostatic 
pressure. | 
In 1866 the Municipality of Paris let a contract for an 
artesian well at Passy to the German engineer, Kind, who 
commenced operations with a hole of nearly 4 feet diameter, 
using a “‘trepan’’ or bit of special construction. A depth 
of over 1,700 feet was reached, when the upper portion of 
the boring collapsed filling up the hole. Operations were 
resumed, and the bore was contracted to a diameter 2 feet 
4 inches, and at a depth of 1,904 feet, a supply, which 
quickly increased to 5,500,000 gallons per diem, was struck; 
this enormous supply is thrown to a height of 54 feet above 
the surface. The cost of this well, which was commenced 
in 1855, and completed in 1861, amounted to nearly £40,000. 
In addition, two other wells are worthy of mention :—that 
at La Chappelle, 5 feet 7 inches in diameter, abandoned at — 
a depth of 1,745 feet; and that at the Butte aux Cailles, 
6 feet in diameter, the details of which I have been unable 
to obtain. These, together with numerous other wells, 
varying from 300 to 400 feet deep, are sunk in what is 
knownasthe Paris Basin. The equal temperature of these 
waters, nearly 80 degrees, would tend to show their com- 
mon source. 
HINGLISH BORES. 
A formation of mesozoic chalk underlies London, forming 
what is known as the London Basin; and this has been 
practically speaking, riddled with borings. It may not be 
generally known, but the sources of the New River, which 
is one of the feeders of the London Water Supply, derive 
