The new encyclopædia Britannica: in 30 volumes |
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Page 583
... biological action that was going on in the trickling filter , by combining the organisms carried by the sludge , oxygen supplied by the incoming air , and new food supplied by the settled waste water entering the aeration tanks . By ...
... biological action that was going on in the trickling filter , by combining the organisms carried by the sludge , oxygen supplied by the incoming air , and new food supplied by the settled waste water entering the aeration tanks . By ...
Page 994
... biological organism and introduced into sociological theory such biological con- cepts as variation , natural selection , and inheritance evolutionary factors resulting in the progress of societies through stages of savagery and ...
... biological organism and introduced into sociological theory such biological con- cepts as variation , natural selection , and inheritance evolutionary factors resulting in the progress of societies through stages of savagery and ...
Page 1018
... biology and ecology ; N.A. BURGES and F. RAW , Soil Biology ( 1967 ) , a comprehensive text on the biology of soil ... biological actions and reactions , the regolith material is transformed into soil that exhibits one to four master ...
... biology and ecology ; N.A. BURGES and F. RAW , Soil Biology ( 1967 ) , a comprehensive text on the biology of soil ... biological actions and reactions , the regolith material is transformed into soil that exhibits one to four master ...
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19th century Africa agriculture American ancient areas army became BIBLIOGRAPHY carpels carpets central centre Christian church communication culture Danish death Denmark dunes early east eastern economic endosperm established Europe European feet Finland fishes flowers forces French fruit genera genus German Iceland important industry Intelsat islands kilometres king land lizards major ment metres miles military Moscow nobility northern Norway organization ovary ovules party peasants percent period petals pitcher pitcher plant plants political population production reforms region reign religion religious republic ritual river Rugby Russian S.F.S.R. Rwanda sacred sacrifice saga sail saints salmoniform salt domes sand sandstones Santalales São Paulo Sarmatians satellite satire Saxifragales sepals ships shrubs social southern Soviet Union species Stalin stamens structure Sweden Swedish taxes territory tion trade traditional trans trees tropical Western