Heinrich Wilhelm Adalbert, a Prussian prince, first cousin of the emperor William, commander-in-chief of the German navy, born Oct. 29, 1811. He travelled in Europe, the East, and Brazil, and printed privately Aus meinem Beisetagebuch (Berlin, 1847), which has been translated and published in English (London, 1848). He holds high military rank, but has devoted himself to naval affairs, and in 1854 was made admiral. In 1856 he commanded the Prussian corvette Danzig on the expedition against the Riff pirates; but as the Prussians numbered only 90 and the pirates 500, he was obliged to retire, losing 24 killed and wounded, and being himself shot through the thigh. In 1864, during the Danish war, he cruised with his fleet in the Baltic, and at its close he was appointed commander-in-chief of the national navy. In 1870 he visited the English seaports with a squadron. During the Franco-German war his ships took refuge in Wilhelmshaven, and he observed the war at the German headquarters.- His wife, Theresa Elssler, sister of the celebrated Fanny, and herself a skilful dancer, received the title of baroness von Barnim on his morganatic marriage with her in 1850. The only offspring of this union, Baron Adalbert von Barnim, born in 1841, died July 12, 1860, in Egypt. The scientific observations made during his journey to that country were published after his death by Dr. Hartmann, his physician (Reise des Freiherrn A. ton Barnim durch Nordost-Afrilca, Berlin, 1863).