siMPSox : tiirp:e deep borings at Halifax. 83 
Here work ceased ; tlie bore was not through the GaUiard, 
which is an extremely trying rock to cut, and the results did 
not justify further boring. Water was obtained, but in in- 
sufficient quantity, and at too low a level to be economically 
serviceable. 
The following water tests were made on June 19th, 1899. 
Before commencing to withdraw, the water stood at a level 
of 159 feet from the surface. A shell was let down, 6 feet long 
and 10 inches diameter, holding 20 gallons, and was filled and 
withdrawn twenty times during the first hour, removing 400 
gallons ; the water level sank 29 feet to 188 feet from the surface. 
The next 35 minutes the shell was used 32 times, and the 
water level fell a further 7 feet, at which it remained whilst 
160 gallons were drawn in 25 minutes more. 
After ceasing to draw, the water rose again as follows : — 
ft. in. 
During the first fifteen minutes . . . . 14 6 
second . . ..80 
third „ „ • . ..46 
fourth „ „ .. ..16 
28 6 
to 166 feet from the surface. 
The Survey Memoirs of this district give the average thick- 
nesses of the various upper members of the Millstone Grits, 
descending from the Rough Rock, as follows : — 
ft. in. 
Rough Rock 108 0 
Flags, or Second Grit 33 0 
Shales 153 0 
White vSandrock, the top beds of the 
Tliird or Middle Grits 127 0 
421 0 
