Hayden, FERDINAND VANDEVEER, LL.D., geologist, was born at Westfield, Massachusetts, 7th September 1829, studied at the Albany medical college, and during the greater part of 1853-62 was employed in surveys in the north-west. He served as surgeon in the Union army during the war, and filled the chair of Mineralogy and Geology in the University of Pennsylvania from 1865 to 1872. In 1867-69 he carried out the geological survey of Nebraska, and afterwards was director of the geological survey of the territories of the United
States, until in 1879 the various national surveys were combined in the geological survey of the United States. Till 1886 Dr Hayden remained at the head of the Montana division. He died 18th January 1888. He published many papers, besides numerous and valuable government reports.