Faum Duainauk. 373 



largest, althougli they are manufactured from one and one- 

 half to six inch hore ; but the amoniit of M-ater tJiat a two 

 inch tile will cai'ry will make quite a stream at its outlet, 

 after having been discharged and spread itself on the 

 ground. Any one wdio has ever carried the water of a 

 large spring in pipe wdll have noticed how nnich smaller 

 the stream appcju-s when condensed into a i-onnd stream by 

 its introduction to the pipe. 



Warring, in his book on draining, gives the following 

 table of sizes required : For two acres, one and one-fonrth 

 inch tiles ; for eight acres, two and one-half inch tiles ; for 

 twenty acres, three and one-half inch tiles ; for forty acres, 

 two three and one-half or one five inch tiles ; for fifty acres, 

 six inch tiles ; for one hundred acres, one eight inch or two 

 six inch tiles. 



Messrs. Shedd & Edson, of Boston, prepared a table, 

 based on Snieaton's experiments, for different sizes of tiles 

 laid in different inclinations or grades, in which they state that 

 a one and one-lialf inch tile, laid witli a fall of one foot in 

 one hundred, will discharge tw^elve thousand and fifty-live 

 (12,055) gallons of water in twenty-four hours. 



The only disadvantage of the small tile would be that it 

 would take a longer time to rid the soil of a fall of water 

 tlian a larger one ; but, to offset that, it has the advantage 

 of running more swiftly, and tJiereby cleai-ing itself more 

 perfectly from an accumulation of silt or nmd, wdn'ch, in 

 some uncommon (^ases, Mill require more than ordinary 

 care to prevent its accumulation and the stoppage of drains. 



I never saw but one such instance, which was where the 

 water came from a side hill of quicksand ; a two inch tile 



