In fact, no general agreement had been reached among chemists as to the classification of elements for nearly half a century after the systems of classification of compounds had become established in general use. Relationships were discerned more readily among the compounds than among the elements it thus occurred that the classification of elements lagged many years behind that of compounds. This rapid expansion of chemical knowledge soon necessitated classification, for on the classification of chemical knowledge are based not only the systematized literature of chemistry but also the laboratory arts by which chemistry is passed on as a living science from one generation of chemists to another. The early years of the 19th century witnessed a rapid development in analytical chemistry-the art of distinguishing different chemical substances-and the consequent building up of a vast body of knowledge of the chemical and physical properties of both elements and compounds.
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