r. 



^i- hav 



i 



ave 



Surface 



IS 



trailed 



'"Nation. 



Sect. XI. I. X. DRAINING ANP WATERING 



2S7 



-\ 



SECT. 



XL 



OP DRAINING AND WATERING LANDS. 



I 



Moraffes are in high or low fit 



Springs rife from thefummits of 



pafs between the fir at a. 3. Strata of the earth about Derby, and 



Lichfieldy and thefprings 



Plains formed in v allies. 5. Wall-fprings 



tercepted by ditches, funk perpendicular to the fides of the hills. 6. By boring 

 holes at the bottom offuch ditches. 7. Ufe of ditches, where the wall-fprings can- 



be intercepted. 



Holes through clay into a f and ft one beneath. 9. Deep 



fprings rife higheft, when bored 



Manyfprings may be raifed higher fh 



their fi 



Enlarging the bottom of wells increafes the 



them 



12. 



Springs difcovered on one fide only of ft 



Difcovered by even- 



ing mijls. By morning rime. By aquatic plants. PFarm fprings . II. i . Draining 



affes, where there is no fall 

 'tries of marble ^ granite, or 



In the craters of ancient volcanoes 

 '.. 4 . Fens below the level of thefea 



3. In 



Should 



he furrounded with dikes. 5. Ufes of aquatic pt 



1 1 1 . I . Of flooding lands, 



Ice preferves the grafs beneath 



ch bored holes in the 



3 . ^d. 



vantages of flooding recapitulated. It deftroys rufhes. Saves manure. 4. Gj«- 



be obferved. Flooding not injurious to health. Vicinity of running 



wholefc 



5. Flooding lands might be performed to a great 



By 



fprifigs, land -floods, and machinery . Hi era's fc 

 and centrifugal pump. 



Horizontal wind-mill 



I. 1. The great quantity of water required for healthy vegetatioti 

 is treated of in Se£l. X. 3. i. But as all extremes are injurious, too 

 much water becomes pernicious to all except aquatic plants. Whence 



■ 



the necefTity of draining thofe lands, which too much abound with 

 moiflure ; the art of which is better undeiftood, (ince the knowledge 



LI 



of 



