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KARL FRIEDRICH MOHR (1806-1879)

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Originally appearing in Volume V18, Page 650 of the 1911 Encyclopedia Britannica.
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KARL See also:

FRIEDRICH See also:MOHR (1806-1879)  , See also:German pharmacist, son of a well-to-do druggist in Coblentz, was See also:born on the 4th of See also:November 1806 . Being a delicate See also:child he received much of his See also:early See also:education at See also:home, in See also:great See also:part in his See also:father's laboratory . To this may be traced much of the skill he showed in devising See also:instruments and methods of See also:analysis . At the See also:age of twenty-one he began to study See also:chemistry under See also:Leopold See also:Gmelin, and, after five years spent in See also:Heidelberg, See also:Berlin and See also:Bonn, returned with the degree of Ph.D. to join his father's See also:establishment . On the See also:death of his father in 184o he succeeded to the business, retiring from it for scientific leisure in 1857 . Serious pecuniary losses led him at the age of fifty-seven to become a privaidozent in Bonn, where in 1867 he was appointed, by the See also:direct See also:influence of the See also:emperor, extraordinary See also:professor of See also:pharmacy . He died at Bonn on the 28th of See also:September 1879 . See also:Mohr was the leading scientific pharmacist of his See also:time in See also:Germany, and he was the author of many improvements in See also:analytical processes . His methods of volumetric analysis were expounded in his Lehrbuch der chemisch-analytischen Titrirmethode (1855), which won the See also:special See also:commendation of See also:Liebig and has run through many See also:editions . His Geschichte der Erde, eine Geologie auf newer Grundlage (1866), also obtained a wide circulation . In a See also:paper " Uber See also:die Natur der Warme," published in the Zeitschrift See also:fur Physik in 1837, he gave one of the earliest See also:general statements of the See also:doctrine of the conservation of See also:energy in the words: " besides the 54 known chemical elements there is in the See also:physical See also:world one See also:agent only, and this is called Kraft (energy) .

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