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 memoir by him, entitled "On a New Series of Organic Bodies containing Metals." This important communication concludes with some theoretical considerations in which the analogy of the organo-metallic bodies with cacodyl is pointed out, and in which that character of elements which has since been termed "atomicity" was first described. In 1857 a royal medal was awarded him by the Royal Society for his "Researches on Organic Radicals and Organo-Metallic Bodies."

In the "Journal of the Chemical Society" (1866) Dr. Frankland published his "System of Notation" by which the formulae of bodies are made to represent the mode in which the atoms composing them are arranged in accordance with their atomicity. This system has proved of great service in elucidating the causes of isomerism in organic compounds. His "Lecture Notes for Chemical Students" was published in 1866—third edition, two volumes, in 1876. His celebrated memoir, "On the Source of Muscular Power," was printed in the "Philosophical Magazine" in 1866. He gave a course of six lectures before the Royal College of Chemistry, entitled "How to teach Chemistry," which was summarized for publication by George Chaloner. Dr. Frankland is the author of numerous papers published from time to time in scientific periodicals, among which may be mentioned, "Observations Economical and Sanitary on the Employment of Chemical Light for Artificial Illumination"; "Contributions to the Knowledge of the Manufacture of Gas"; "Researches on the Influence of Atmospheric Pressure on the Light of Gas, Candle, and other Flames"; on "Winter Sanitariums in the Alps and Elsewhere"; on the "Purification of Town Drainage and other Polluted Liquids"; and on "The Composition and Qualities of Water used for Drinking and other Purposes." He is also the author, conjointly with Mr. J. Norman Lockyer, of "Researches connected with the Atmosphere of the Sun."

In 1857 Professor Frankland published "Experimental Researches in Pure, Applied, and Physical Chemistry." It forms a volume of over a thousand pages, which was issued by John Van Voorst, of London, and embraces the main researches of his scientific career. It has a very full table of contents, an exhaustive index, and a large number of illustrations of apparatus used in research; graphic tables are also included, representing to the eye the results of extensive series of experimental investigations. The volume embraces the records of experimental work in pure, applied, and physical chemistry, extending over thirty years, and scattered through many English and foreign transactions and journals. They are grouped into subjects and arranged chronologically, with a new introduction to each chapter, showing its scope, the relations of the several papers to each other, and their bearing on subsequent inquiries. A uniform system of nomenclature and notation is adopted (except in the section on applied chemistry), the principles of which are explained in an opening memoir. The work is thus unified, and, being carefully edited and revised so as to