120 
Jieconh of the. Geolofical Survey of India. 
[vOL. XIII, 
Poiilain) all at once, at a stroke of tlie borer, tbe water rose rapidly and flowed 
out over tbe mouth of the tube at nearly 3'28 feet above the soil. It then 
fell and rose in the tube, ceased to flow, and finally lowered rapidly, at a depth 
of 163-57 feet. The auger still continued through what are to all appearance 
l)crmeable beds, though no further rise took place until at nearly 178 feet, when 
there was a powerful discharge of sand. This having been gradually reduced, the ■ 
water rose to a height of 11-70 inches over the soil with a dischar-ge of 19-81 
gallons a minute. 
I do not think we can here, below the .second band of clay, consider [that 
more than one water sheet hrs been tajipcd. The odd 
behaviour of the water 
Docs not imply tlmt 
(licrc are more tliaii one 
slicet below last se-am. 
in its oscillations being in gi’eat 
measure attributable to a possible choking up of the material 
round the bottom of the tube as it was forced down among varied sands, in which 
are at times seams of clay-galls and other fragments of clayey material: while in 
the new movements supei-induced among the water channels or passages by this 
suddenly oponed-up vent, it is quite possible that there may have been frequent 
blocks. The height of the jet was, however, poor as compared with what had been 
attained in the earlier stages of the boring, and this and the discharge -were only 
attained after some days. The discharge when I saw the well in December last was 
about 44 gallons a minute, with a hydrostatic level of about one foot over soil. 
For the beds exhibited by' this boring: it is to be noted that there are two 
Two wcllflefincdse.Tms well-defined and thick seams of clay which act perfectly 
or bands of clay. as impermeable band.s, from under which water rises over 
the level of the soil. The lower clay seam is, however, separable into three divi¬ 
sions by two thin seams of sand, from each of which there was a gush of water. 
Position. 
The Oopallem Well. 
This is situated within the compound or yard of the Oopallem filature on the 
Pondicherry-Cuddalore high road, and in the depression of the same small stream 
passing to the south-west of Pondieheny. It is within 
820 yards of the sea shore, but about 650 yards to the 
south of the parallel of the Savana well, and about 100 yards from the left 
bank of the Edoupar stream. 
The present discharge is 99-5 gallons' a minute at a hydrostatic level of 
Tbe tubing and dis- '^'28 feet. The tube has an internal diameter of 7-08 
ebarge of water. inches, and is 119 feet long. 
The water is very similar in character to that of the Savana well; if any¬ 
thing it appeared to me to be more sparkling and to have 
Tbe water. rather a bluer tinge. The suljihui’ous odour is stronger. 
The same vegetable matter forms and floats olf on the surface, perhaps rather 
more quickly and in better growth owing to the free exposure to air and light; 
the bed of the channel leading away from the basin is coated with a some¬ 
what similar growth, and this again is covered by a veiy thin bro-^vn ferruginous 
scum. The water was distinctly tepid to the touch in the cool weather of 
December, and is of about the same temperature as that of the Savana; it is drunk 
freely by the natives. 
