HAYS, Isaac, physician, born in Philadelphia, , Pennsylvania, 5 July, 1796; died there, 13 April, 1879. He was graduated at the University of Pennsylvania in 1816, and at the medical department of that institution in 1820. Dr. Hays became known to the public principally through his editorial work on medical journals and books. In February, 1827, he joined the staff of the " Philadelphia Journal of the Medical and Physical Sciences," which had been established in 1820, becoming its sole editor in November of the same year, when with enlargement this paper assumed the name of "The American Journal of the Medical Sciences," and he continued in that capacity until 1869, when his son, Dr. I. Minis Hays, became his associate. Of all the other medical journals in existence at the time of its establishment, the sole survivor (1887) is the " Edinburgh Medical Journal." In 1843 he established the " Medical News," and in 1874 the" Monthly Abstract of Medical Science," both of which journals were also published in Philadelphia. He was elected a member of the Academy of natural sciences of Philadelphia in 1818, and was its president from 1865 till 1869, also one of the founders, and for many years secretary, of the Franklin institute, being at the time of his death its oldest member. Dr. Hays was one of the oldest members of the College of physicians in Philadelphia. and for many years one of its censors. Besides being a member of scientific bodies both at home and abroad, he was one of the founders of the American medical association, and author of its code of ethics, which has been since adopted by every state and county medical society in the United States. In addition to his journals, he edited Wilson's "American Ornithology" (Philadelphia, 1828); Hoblyn's "Dictionary of Terms used in Medicine and the Collateral Sciences" (1846; new ed., 1855); Laurence's "Treatise on Diseases of the Eve" (1847; several new eds.); and Arnott's "Elemenis of Physics " (1855).