266 



DRAINING 



Sect. XI. i. lo. 



{o high as to flow over the fuiface. And there is reafoii to conckid 

 that u (\m\\ar experiments were naade in many other places, fuch a 

 tificial fprings might be produced at fmall expencc^ both for the con 

 )n purpofcs of life, and for the great improvement of lands b 



m 



gth 



y 



A 



of 



r 



dedudion, which may be made from this knowled 



geol 



y 



IS 



th 



ny fp 



o 



f 



hich 



o 



for 



jf 



or 



th 



e 



fe 



01 



a 



or 



purpofes of 



for watering higher grounds 



gardening, may in many fi 

 le or no lofs. Thus when 



be dammed up many feet with lit 



bridge was building at Dublin, Mr. G. Semple found a fpring in th 



bed 



o 



f th 



e 



here he mea 



to 



the found 



f 



or a 



hich by fixing iron pipes into it he raifed many feet ; and 



pier; 



bor- 



ing a hole near the Derwent in Derby about fifteen yards deep, the 

 water rofe above the furfaceof the ground, and has continued to flow 

 now for above twelve years in rather an incrcafing quantity. From^ 

 having obferved a valley north- wefl of St.Alkmund*s well near Derby, 

 at the head of which that fpring of water once probably exifted, and 

 by its current formed the valley, (which current in after times found 



way 



prefent 



fituation), I fufped, that St. Alk 



mond's well might by building round it be raifed high enough to- 

 i^upply many flreets in Derby with fpring water, which are now only 

 fupplied with river water. 



II. A third deducSlion from the knowledo^e of this o-eoloo-v con- 

 cernmg the production of fprings fceaches, that by enlarging the bot- 

 tom of a well, where the water oozes from between the furroundino- 

 flrata in too fcanty a fupply, a proportionally greater quantity of wa- 

 ter may be procured. The hole near the river Derwent in Derby 

 above mentioned, i'S about an inch and a half in diameter, and was 



7 



bored about fifteen yards deep through the uppermofl f^ratura of marl 

 into the fand beneath it, and fupplies Dr. Darwin's houfe with two 



i 



or 



three 



hogflieads of water a day. And ?vlr. Strutt near St. Pe- 

 ter's 



/ 



»' 



