338 MARKET DAIRYING 
the dairy house, should stand on slightly elevated ground 
so as to insure drainage away from it. 
Construction of Well. In a properly constructed 
well, no water should enter it except near the bottom. 
This compels the water to pass through a thickness of 
earth sufficient to purify it where the wells are of a 
reasonable depth. 
Where there is no rock or hard clay and where the 
Ordinary Vell. 
i Artesian 
Ha] Paes yy ab 
WI) OY 8 . 
WM SG 
WP. << S ~~ 
Za < \\ 
\\ 
ese 
Fig. 71.—Soil Strata. (From Harrington’s ‘Practical Hygiene.’’) 
water can be had at a reasonable depth, the driven well, 
commonly known as the Abyssinian tube well, is the 
cheapest and one of the safest. This well is made by 
driving into the ground a water-tight iron tube, the lower 
end of which is pointed and perforated. 
In case rocks and hard clay must be penetrated, or great 
depth must be reached to secure water, the bored or 
drilled well, piped from top to bottom with water-tight 
iron pipes, will be found most satisfactory. 
