Few men, if any, so eminent in science and philosophy have been known to live and die in such obscurity as the subject of this paper. A mathematician whose knowledge has never been fathomed, an original investigator in terrestrial and celestial chemistry, most of whose speculations are now accepted as law; a contributor to the philosophical journals of Europe, whose papers were received with distinguished favor; an astronomer, who, in those papers, ventured to differ with Laplace, and, too, as will be shown, a man skilled in classical scholarship, yet unknown to his nearest neighbors and recognized by only a few in his own city. He lived and died in obscurity and poverty in a city distinguished for its schools of science and art, and the liberality and public spirit of its men of wealth; who, if any, were to blame? One object of this paper is to unravel the mystery. HIS BIRTHPLACE AND PARENTAGE. Daniel Vaughn was born in the year 1818 at Glenomara, four miles from Killaloe, County Clare, Ireland. His father's name was John, who had two brothers, Daniel and Patrick. John, like Daniel, was educated for the church, but, being the eldest son, remained on the farm. Daniel became, subsequently, the parish priest of Killaloe, and in 1845 was ordained Bishop. John Vaughn had three children, Daniel (the subject of this paper), Owen and Margaret, afterward Mrs. Kent. The distance to the nearest school being four Irish miles, John had his sons educated by a tutor till they were prepared to enter a classical academy. At the age of about sixteen Dan, as he was familiarly called, was placed under the care of his uncle and namesake at Killaloe, where he entered the academy. There the young student pursued the study of Greek, Latin and mathematics, giving some attention to certain branches of physics, for which he evinced peculiar aptitude. HE EMIGRATES AND FINDS A HOME. About the year 1840 his uncle, desirous of having the young man enter the church, advanced him a sum of money to defray his expenses at a theological school in Cork, but on seeing the American liners when he reached Queenstown, the temptation to take the voyage to the land of promise was too great for the young adventurer to resist, so he secured a passage to New York. When at school he made wonderful advancement in study, especially in higher mathematics, and felt he ought to go to a country where he could be free to pursue his favorite line of thought and where attainments in science would not be circumscribed, as in the church.