On the 4th August, 1805, a few years before the great circle was erected at the Observatory, William Rowan Hamilton was born in No. 36, Dominick Street, Dublin. He was educated by his uncle, the Rev. James Hamilton, at Trim, and his aunt, Jane Sidney Hamilton. The astounding precocity of the child is thus described by his biographer, Mr. Graves, to whose laborious and painstaking execution of his great task I must here make my acknowledgments. Of William Rowan Hamilton it is asserted that, “continuing a vigorous child in spirits and playfulness, he was, at three years of age, a superior reader of English and considerably advanced in arithmetic; at four, a good geographer; at five, able to read and translate Latin, Greek, and Hebrew, and loving to recite Dryden, Collins, Milton, and Homer; at eight he has added Italian and French, and given vent to his feelings in extemporised Latin; and before he is ten he is a student of Arabic and Sanskrit. And all this knowledge seems to have been acquired, not indeed without diligence, but with perfect ease, and applied, as occasion arose, with practical judgment and tact.”[107] When Hamilton was seventeen years old (1822), he had written original mathematical papers, and with two of these--entitled respectively, “Osculating Parabola to Curves of Double Curvature,” and “On Contacts between Algebraic Curves and Surfaces”--he paid a visit to Dr. Brinkley at the Observatory. The Royal Astronomer was impressed by their value, and desired to see them in a more developed form. Thus originated an acquaintance between the scientific veteran, soon to be a Bishop, and the brilliant lad about to enter college.