196 
'Records of the Geological Survey of India. 
[vOL. XIII. 
these of water was tapped at 49'20 feet, which remained at nearly a foot below 
surface soil. The rise increased on the boring being carried deeper, and even¬ 
tually stood at the level of the ground, which is, however, 1'47 feet above the 
surface level at Savana, that is, 10'47 feet above sea-level. The discharge is 17’6 
gallons a minute, but the tube is filled with sand for more than 3 feet from the 
bottom, which when cleared may allow of an increased flow. 
A block of wood or a tree trunk was met with embedded in the sand at 72 
feet, which disappeared, however, in some unaccountable manner after being cut 
at with the jumper for two or three days. Mr. Poulain seems to think that it 
may have been carried off by the current of water at this horizon; but such free¬ 
dom of motion is hardly conceivable in alluvial stratathe trunk has been 
probably just shoved aside. 
The beds traversed are ;— 
Feet. 
Vegetable mould. 1‘96 
Sandy soil.. • 31'65 
Black clay .......... 7‘87 
Coarse and fine sand.39’36 
This succession would tie in W'ell with the sections exposed by the Savana, 
Jardin d’Acclimatation, and Upallem borings, though the clay band has thinned 
out a good deal from what it is at the Savana well. 
Another well was commenced last year in the village of Archiwakum, about 
7 miles south of Pondicherry, which reached a depth of 144'32 feet, after 
passing through the following strata:— 
Feet. 
Vegetable mould ........ 1'64 
Bed sandy soil. 13'12 
Micaceous sand ......... 13'12 
Very bard clay of yellowish colour, streaked with veins of 
light green clay, with some layers of white sand . . 111'52 
“ A sort of Molasse ” of reddish yellow colour . . . 3'28 
Sand! 
The water asiended from the later deposit to within 6’56 feet of the surface 
soil, the wells of the neighbourhood having their water at 13'77 feet below sur¬ 
face, or perhaps about sea level. 
This boring is stopped for the present, as the pipe cannot be forced down 
any further ; but a second pipe is to be inserted in this, after which better jiro- 
gress may bo made. 
The boring in Mr. Cornet’s compound, which was noticed in my previous 
paper (?. c. p. 115), has been again continued with the ho23e of finding a sheet of 
bettor water. It is, 1 believe, nearer the sea than any of the other wells to the 
south, and a certain oscillation of the hydrostatic level of that sheet w^as observed 
• Free and cavernous pas'’.ngcs arc, I fancy, only possible in bard ami rocky strata, and most 
freipieutly in soluble rocks, sucb as limestones. 
