624 THE PRACTICE OF FORMING BOOK II. 



For more particulars respecting the preservation of water, see 

 Marshall's Rural (Economy of Yorkshire, Le Blond on Gar- 

 dens, and " The Art of Fountains, by F. J. Francois*." 



* This author recommends boring for the discovery of springs, and probably 

 suggested the first hints of Elkington's Mode of Draining. 



