PAKT 2.j Kivfj: on the Arlesian Jf'dls al Fondicherry. 113 
EXPLANATION OF PLATES. 
PLATE I. 
Eigs. 1 to 3. Nautilits BiiAnsiANicus, n. s. 
Fig. 4. OxOCHEAS WOOBVARDI, 11. S. 
Fig. 5. „ var. undatxtji, ii. s. 
PLATE II. 
Figs. 1 to 6. Otocbkas woodwaedi, ii. s. 
PLATE in. 
Figs. 1 to 7. OpniCEEAS TIBETICXiM, 11 . S. 
Fig. 8. „ IXIMALAYANUM, 11. S. 
Fig. 9. „ MEDIXTM, 11. S. 
Fig. 19. TeACHYCEEAS GIBBOStTM, 11. S. 
PLATE IV. 
Profile of Trias and Rlicetic bods of Sbal-Slial in the Tibetan Himalayas. 
The elevation of the base of the cliff (carbonifoi’ons quartzite) is about 14,000 
feet above the sea. 
On the Artesian Wells at Pondicheert, and the possibility of finding such 
SOURCES OF WATER-SUPPLY AT MADRAS, llj WiLLIAM KiNG, b.A., Deputy Super- 
intendent, Geological Survey of India. 
Some three years ago it xvas announced that ojierations had been commenced 
History and progress. Pondicherry with a view to tlie discovery of arte. 
sian Avolls,—a doubtful enough experiment when the 
position of that city on a wide alluvial flat bordei’ing the sea is taken into ac¬ 
count, and that few of the ordinary physical or stratigraphical features, usually 
considered as giving pi'omLse of such outflows of watei’, are apparent at fir.st 
sight. Such featui'es do, however, occur partially; and their possible existence 
became gradually' so impressed on the mind of Mr. Ch. Poulain, the manager of 
the Savana and Oopallem cotton mills, that he urged on the proprietors the advis¬ 
ability' of making experiments, and ultimately carried out a boring with such suc¬ 
cess that water is now issuing from the tube with a hy'drostatic level of nearly 
three feet over the surface soil and a discharge of 44 imperial gallons in the 
minute. 
Mr. Poulain, from time to time, during the progress of this first well, read 
a series of papers before the Goveimment Commission on artesian wells, in 
which he gave his reasons on geological and physico-geographical grounds for 
expecting that w'ator-beai’ing strata, or sheets of water with a head, might be 
tapped under the Pondicherry plain, at the same time giving short notes of the 
progress of his wmrk.' The data so recorded and other information obtained per¬ 
sonally from this gentleman have been largely included in the pi’oscnt paper. 
' Sue Aiipcudix 2. 
