WHITTEMORE, Don Juan, civil engineer, born in Milton, Vermont, 6 December, 1830. He received his early education from his father, who was a lawyer, and then spent two terms at the Bakersfield academy. In 1847 he became an engineer, and in 1853-'7 was made chief assistant engineer of the La Crosse and Milwaukee railroad, after which he was chief engineer of the Southern Minnesota railway company. His health then failing, he accepted the place of chief assistant engineer of the Western railway of Cuba, but returned to the United States in 1861, and became chief assistant engineer of the La Crosse and Milwaukee railroad. In 1865 he was appointed chief assistant engineer of the Chicago, Milwaukee, and St. Paul railway company, and in 1866 its chief engineer. At that time the road was only 275 miles, but it has steadily increased until it is now 5,675, being the largest railway under one ownership and management in the world. He has had charge of the construction of 2,700 miles of railway line and bridges, including those across Mississippi river at La Crosse, Minneapolis, and Sabula, and across Missouri river at Kansas City. During 1874-'5 he became much interested in the subject of hydraulic cement, and experimented with a product made from stone found near Milwaukee. From these investigations has resulted the establishment of works that now produce 400,000 barrels yearly. A switch-stand of his invention is now in use on more than one tenth the mileage of railways in the United States. The degree of C. E. was conferred on him by the University of Vermont in 1884, and that of Ph.D. by the University of Wisconsin in 1884. He is a member of scientific societies and was president of the American society of civil engineers in 1884.