lieconh of the Geological Survey of India. 
[voL. xin. 
i 91. 
Additional note on the Aktesian Wells at Pondicheery, hg W. King, Deputy 
Supervutendeut (^Madras), Geological Survey of India. 
While my paper in the last number of the Records was in press, I received 
some further details from Mr. Poulain, giving corrected heights and discharges 
of water columns in the Savana and IJpallom wells, which were inserted in the 
body of the paper, but not in the introduction. Unfortunately T misunder.stood 
some of these corrections, as they arc explained in a later letter i-eooivcd from 
Mr. Poulain, and therefore it becomes necessary to draw attention to the fol¬ 
lowing errors:— 
On page 113, line 33, for ‘three’ read 6'5; for ‘44’ read 30. 
On page 114, line 16, for ‘ nearly 1 foot ’ read 3'28 feet. 
On page 120, lino 21, for ‘ 44,’ read 30; for ‘ one ’ read six. 
These corrections are made from a later note published in the ‘ Travaux 
lies Gom/missions Locales' which my friend Poulain has furnished since the publi¬ 
cation of my paper, and of the existence of which I was unaware until now. A 
translation of this note is now appended ; it follows as number five on the ‘ Ex¬ 
periences of Mr. Poulain’ given in Appendix II of my paper, 
Experience at “ Savana.” 
“ The latest information given on the progress of the borings up to the 
11th September left the depth at 52’68 meters and the discharge at 90 litres 
a minute. 
“ The discharge increased jiroportionally with the disengagement of the 
sands at the bottom of the a8<5ending column. It is now at 135 litres a minute. 
During the working the water had a very marked yellow-ochrey colour, and it 
became limpid as soon as the work was stopped. The actual depth is 53 meters. 
“Wo have verified the hydrostatic level of this source, and as the ground 
surrounding our well has lately been raised by the heaping uj) of the excavated 
material, we have boon obliged for exactness to take the level of the old soil. 
This having been ascertained, the rise is 1‘96 meters above the soil. The water 
has not lowered from this point. 
“ Regarding the uses to which the water of the ‘ Savana ’ well may be 
applied, we cannot do better than reproduce in text the official analysis given by 
Mr. Castaing, Ohof do Service Pharmaceutique, at the requisition of the 
Ordonnatour;—“ Depth of the well, 52’68 meters. This water is limpid, colour- 
loss, inodorous, agreeable to the taste, and fresh. It contains 26 centigrammes 
of saline residue to the litre, composed of earthy chlorides and sulphates. It 
mai'ks 7 degrees on the ‘ hydrotimetre.’ It boils vegetables well, dis-solves soap, 
and does not contain any organic matter. It possesses all the r-equisite condi¬ 
tions of a potable water, and is adapted for all culinary and industrial uses. It 
will leave only a feeble deposit in boilers if it be allowed to settle for a short 
time.” 
“ Prom an agricultural point of view, and in the opinion of several nativ'e 
cultivatoi’s, the quantity of water now furnished by the well would be sufficient 
