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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Dmitry I. Mendeleyev discovered in the mid-19th century that the chemical
elements show a periodic recurrence of properties when they are arranged in a
certain order, which is approximately the order of increasing atomic weight.
Commercial production of chemicals from this source dates from 1919. Today
catalytic cracking is a valuable source of propylene and n-butylenes but not a
very good one of ethylene, a most important petroleum chemical. It is important to
knowledge, and chemical therapy in medicine. His influence was widely felt in
succeeding generations. During the first half of the 17th century, there were few
established doctrines that chemists generally accepted as a framework. As a
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LibraryThing ReviewUser Review - keylawk - LibraryThing
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