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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Around the turn of the century, a French botanist, O. Lignier, pub- Lignier's lished
a plausible theory that the ancestor of the vascular theory plants was a branching
, filamentous green alga adapted to growing on tidal flats. Algae isolated in ...
Another common goal of plant breeding is to extend the area of production of a
crop species. A good example is the modification of grain sorghum since its
introduction to the United States about 100 years ago. Of tropical origin, grain
Representative plants of the two parental inbreds are at left. To their right are
vigorous FI hybrids and the F2 through FB selled generations. The decline in
vigour from FI through Fe is similar to that observed when plants from open-
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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