Ehrenberg, CHRISTIAN GOTTFRIED, naturalist, was born 19th April 1795, at Delitzsch, in Prussian Saxony. He studied at Leipzig and
Berlin; in 1820-26 he visited Egypt, Syria, and Arabia; in 1827 was appointed to a medical chair at Berlin; in 1829 accompanied Humboldt on an expedition to the Ural and Altai Mountains; and in 1838 travelled in France and England. He died 27th June 1876. His twenty-four works, published between 1828 and 1876, give the fruits of his patient study of microscopic organisms, a branch of science of which he was indeed the founder. See the articles INFUSORIA, ROTIFERA, &c. There is a Life by Hanstein (Bonn, 1877).