LÖFFLER, FRIEDRICH (1852-1915), German biologist, was born at Frankfort-on-the-Oder June 24 1852 and educated at the universities of Würzburg and Berlin. He early began the study of parasitic diseases, and his description of the bacillus of diphtheria, published in 1884, was the originating cause of the modern anti-toxin treatment. He died in Berlin April 8 1915.