FRERICHS, FRIEDRICH THEODOR German pathologist, became professor of pathology at Gottingen (1848), at Kiel (185o), at Breslau (1852) and Berlin (1859). He developed scientific clinical teaching in Germany. He discovered leucin and tyrosin in the urine in cases of acute yellow atrophy of the liver (1855), made pathological studies of cirrhosis of the liver and of pernicious malarial fever, and published works on Bright's disease (1851) and diseases of the liver (i858).