DETAILED ACCOUNT OF SOME RECENT EXPERIMENTS. 



57 



Karikal boring. 



mentioned again in connection with other experiments carried out in 

 rocks of that class. 



A trial was also made in 1881-82 at Karikal, a town whose 

 geographical and geological situation resembles 

 that of Pondicherry. The undertaking did not 

 meet with the same success as at Pondicherry although two artesian 

 sheets were struck, the first one at a depth of 346 feet, which rose to 

 within 4 inches of the surface, and a second one at a depth of 347 

 feet, which overflowed. The hydrostatic head of the latter was 6£ 

 feet above the level of the ground, but its delivery was only 22 

 gallons a minute. A copy of the boring record communicated by the 

 French Government Engineer is herewith appended. Like the 

 Chandernagore boring record, it is printed in the original language 

 with only the addition of the measurements in feet:— 



Coupe geologique du Putts Artesien de Karikel. 



Number 



of 

 stratum. 



Thickness 

 of stratum 

 in metres. 



Depth from 



ground-level 



in metres. 



Thickness 



of stratum 



in feet. 



Depth from 



ground-level 



in feet. 



Description of strata. 



1 



200 



200 



6 S 6 



65 



Terrain naturel. Sable 

 gris-noir terreux. 



2 



o-45 



2 '45 



i-47 



8-o 



Sable gris-noir terreux 

 avec melange de sable 

 jaune-brun fin. 



3 



079 



3 - 24 



2'59 



io'6 



Sable gris-noir argileux. 



4 



1 '04 



4-28 



3'4i 



14-0 



Argile noire plastique avec 

 oxyde de fer et melee de 

 sable blanc, gris et jaune- 

 brun. 



5 



I "02 



5-30 



3" 34 



"7*3 



Argine jaune-brun melde 

 de sable. 



6 



I '40 



670 



4'59 



210, 



Sable fin jaune-brun avec 

 petits graviers. 



7 



075 



745 



2'46 



24-4 



Sable moyen jaunatre avec 

 graviers et gres ferru- 

 gineux. 



( 57 ) 



