PART £.] 
133 
King; on the Arlesian Wells al Pundiclierrg. 
•wifcliout any sensible diminution up to tbe present time. The dischai’ge also 
gradually obtained its present rate, and there has been no .sensible decrease. 
The gush must then be due to hydrostatic pressure, and the wells must 
The wells artesian considered, as was always contended for by Mr. Poulain, 
as properly artesian. 
The water is generally of the same quality and constitution in each well; if 
anything, that of the Oopallem well is brighter, clearer, 
alHhe wells It contains the same vegetable 
germs. 
The boi’ings are all in the alluvial deposits; but one of them (that of the 
. Ville ISoirc) is near the bottom of these. There is a 
the bands ot perme- , . 
able and impermeable certain relation between the beds pierced in each bore- 
strata appear to be tbe hole, which leads to the conclusion that groups of them 
are continuous over the area tapped. The upper clay seam 
or band certainly appears to be the same in all; it is very nearly the same thick¬ 
ness throughout, and it is the estuarine set of beds usually found at such a depth 
on the Coromandel. The second clay seam is not so clearly represented in each 
section; but there are strong points of similarity. A peculiar pyritous set of 
beds associated “with seams of vegetable debris occurs once in the garden well 
and twice in the boring at the Villo Nome, and that in the former appears to 
correspond to the upper one in the latter. 
The Savana, Garden, and Oopallem wells are nearly in a line ranging, from 
the first, in an oast-south-east line for about 470 yards to 
The strata have a^shght garden, and then sonth-east-by-south for about 770 
dip to the eastward. a ’ 
yards to Oopallem, that is, tolerably in the line of dip 
which the strata might be supposed to have in this locality. 
In the Savana and Garden wells, the upper clay seam has a dip of 2® to 3*^ to 
the eastward, and from this lino it rises slightly to the Ville Noire section. Very 
nearly at the same depth below the upper clay band comes the second seam, but 
it has a flatter lie ; indeed, it wmuld aiJpear to be almost horizontal in the tri¬ 
angular area formed by the Savana, Garden, and Ville Noire points. 
A rise of wmter took place in the Gardens from the sandy beds above the 
Conjecture as to the upper clay seam, w^hich seems to indicate that its head 
“head’ of the 1st rise of be at no great distance from Pondicherry, 
water; aud the Oopallem •' ° , _ , ■ 
sPeet. Water gushed in this and the Savana borings from the 
permeable band below the upper clays; but the flow did not give promise of 
permanency. I think, however, the Oopallem water rises from the arenaceous 
band between the two main clay seams. 
In both the Savana and Garden wells the jet now obtained began at different 
levels in the arenaceous strata below the second clay seam. It is questionable 
whether these rise from separate sheets. 
If the upper clay seam preserves its dip and is continued to the w^estward. 
Conjectures as to the it might crop up to the surface at two miles back, or in 
lie of the strata. the bed of the Ariancu)) or Gingee river at only a few 
miles west of Pondicherry. It is also possible that the lower seam might crop 
up within six miles west of the new vents. On this it is conjecturable that the 
