P4IIT 2.] 
Appendix I. 
113 
Table of Geological Strata of the Artesian Well bored in the Jardin d’AccUmatation 
at Pondicherry —coucld. 
Number of 
Strata. 
Dates, 
Geological Strata. 
Thicknesses 
of Strata. 
Progressive 
Depths. 
Remabks. 
M. 
M. 
50 
3rd, 4th, 5th, 6th, 
and 7tli February 
1879. 
A moderate sized sand, grits, 
small gravel, decayed wood 
and iron ore. 
4-20 
77-80 
51 
7th, 8th, 10th, 11th, 
and 12th February 
1879. 
Moderately gray sand, lumps of 
clay, grits, small gravel, de¬ 
cayed wood and iron ore. 
0-60 
78-40 
(79-34) 4th gush. 
52 
12th, 13 th, 14th, 
and 15th February 
1879. 
Moderately gray sand, grits, 
decayed wood, small gravel 
and iron ore. 
1-12 
79-52 
Drawn up by the Colonial Engineer, Chef du Service of Roads and Bridges. 
A. CAERIOL, 
The 24th March 1879. Pondicherry, 
On the 16th November, after thirteen days of work, a rise of water-level was found at a 
depth of 10'74 metres. The water-level, which was originally 2'80 metres below the level of 
the soil, rose to 1'27 metres. The water was of the same character as that of surrounding 
wells, the water-level of which remained stationary at 2'80 metres. 
These first 10 74 metres (which gave a mean depth sunk of '82 of a metro per diem of 
ten hours of actual work) consisted of alternate layers of ordinary gravel mixed with clay, 
fine and very fluid sand, lumps of black plastic clay, bits of decayed wood, and of coarse 
blackish sand mixed with black clay, and were bored cither by a rotating auger (tariere), or 
by means of a “ soupape a boulet.” This last implement produced the best results, especially 
in quicksand, during the whole course of operations. 
Erom the 16th November to the 20th December, boring continued without interruption ; 
the level of the rising water rose higher and higher; from 1’27 metres, which it had when 
first met with, it rose till it was not more than '96 of a metre below the surface of the 
ground on the 18th. It remained at this level till the 20th December, on which date at a 
depth of 66’50 metres, a gush of water was encountered. 
'J'his outflow showed itself on the night of the 19th. The temperature of the water was 
31° centigrade, and its hydrostatic level rose '66 of a metre above the level of the ground. 
During the boring, the water rose and fell intermittently, varying between ‘40 and "44 of a 
metre. This was the result of the continuance of the operations. On the 21st December, 
the hydrostatic level rose to '99 of a metre and gave a discharge of 140 litres a minute. Work 
was carried on at this time in a stratum of coarse gravel mixed with clay and small gravel. 
The water-level remained stationary for some tune ; the discharge increased considerably, 
rising from 140 to 224 litres between the 21st and the 24th December. The temperature of 
the water was 34°, -and on analysis by Moris. Cazalis, 1st Class Chemist of Marino, showed 
