The New Encyclopaedia Britannica
Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries - 934 pages
 Propaedia: outline of knowledge and guide to the Britannica.--- Micropaedia: ready reference and index.--- Macropaedia: knowledge in depth.
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The use of microorganisms to destroy insect pests began in the late 1800s and
early 1900s. With the appearance of the synthetic organic insecticides, however,
emphasis was placed on chemical control, and biological means fell into neglect.
Growth, repair, reproduction, and other dynamic processes performed by
organisms require light energy that is absorbed by chlorophyll pigments in green
plants and stored as chemical energy in organic products, especially
Polyethylene glycol oxalate, polyester-2,2, melts around 200° C, whereas
polyester-6,6 melts around 80° C. The former is soluble in only a few selected
organic liquids; the latter dissolves readily in most ordinary organic solvents,
such as ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review