The Cycle of Life:
An History of Experimental Ecology

Graves Forestry & Environmental Studies Library
Sterling Memorial
Manuscripts & Archives
Kline Sciences
Medical Historical
Exhibit Map

The cycle of life concept played an especially fundamental role in sciences related to forestry and environentalism. Knowledge of "humus" changed from "a black substance perhaps necessary to plant growth" in the 18th century, to being the medium in which microbes broke down the accumulated dead vegetable material making it available for the next generation of living organisms. The founders of organic farming applied this natural process in their reform of agricultural practices in the mid 20th century.

In several posters find the follwing items:
Justus Liebig, Agricultural textbook, 1845
Jean Baptiste Bouusingault, Economie rurale, 1849
John Pitkin Norton, Agricultural report, 1842
William Henry Brewer, Up the California Coast, 1868
Selman Waksman, Humus, 1939
Lloyd Ackert
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