Heinrichs, Die Lohengrindichtung and ihre Deutung (Hamm i.
In 1677 he described and illustrated the spermatozoa in dogs and other animals, though in this discovery Stephen Hamm had anticipated him by a few months; and he investigated the structure of the teeth, crystalline lens, muscle, &c. In 1680 he noticed that yeast consists of minute globular particles, and he described the different structure of the stem in monocotyledonous and dicotyledonous plants.
Born at Hamm on the Sieg on the 30th of March 1818, being the son of Gottfried Raiffeisen, burgomaster of that place.
Hamm, Manila and the Philippines (London, 1898); J.
HAMM, a town of Germany, in the Prussian province of Westphalia, on the Lippe, 19 m.