Practical preventive medicine . Roricultural draintile pipe \y5Mpsof far paperV laid aw tops of joints Hollow brick/aid radially ^Manhole frame and cover. /-?/ / / A 1 o-a | a ? ? ? a d IAi /lap DD a°l//J |aa| ao an ? ? |/ |QD dd aaj/ De+aita of Hollow Bric/% Pig. 28.—Hollow brick cesspool of the leaching type with overflow into agri-cultural tile. (Horton: N. Y. State Dept. Health.) (b) Leaching Cesspools.—These do not have either a lightbottom or walls. The liquid contents escape into the soilbelow the zone of active oxidation and hence may contaminatethe ground water for some distance. They
Practical preventive medicine . Roricultural draintile pipe \y5Mpsof far paperV laid aw tops of joints Hollow brick/aid radially ^Manhole frame and cover. /-?/ / / A 1 o-a | a ? ? ? a d IAi /lap DD a°l//J |aa| ao an ? ? |/ |QD dd aaj/ De+aita of Hollow Bric/% Pig. 28.—Hollow brick cesspool of the leaching type with overflow into agri-cultural tile. (Horton: N. Y. State Dept. Health.) (b) Leaching Cesspools.—These do not have either a lightbottom or walls. The liquid contents escape into the soilbelow the zone of active oxidation and hence may contaminatethe ground water for some distance. They should not be usedin clay or gravely soils or in limestone regions (Fig. 28). REFERENCES Rosenau: Preventive Medicine and Hygiene, 3rd Ed., Sewage Disposal, by George C. Whipple, Sec. VII, pp. : The Operation of Sewage Disposal : A Sanitary Privy System for Unsewered Towns and Villages. Public Health Bulletin No. 89. U. S. P. H. S. EXCRETA DISPOSAL 123 Hansen: Disposal of Sewage from Country Homes, Small Institutions and Country Clubs. Illinois Health News. Aug., 1916. Published by 111. State Board of He
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