. Transactions. Enquête de l'Ohio sous le Dr Newberry. Le travail à Ohiowa a largement été exécuté pendant les vacances de l'Université de Wiscon-sin, dont le président Roland Irving a été appelé en 1870. Plus tard, sa résidence dans le Wisconsin a mené à deux événements de première importance dans l'histoire de la géologie américaine. Il a commencé l'étude de la gamme de fer gogebic et a attrapé le indice à l'origine et la stratigraphie des minerais de fer de toutes les gammes du lac supérieur; et il a ensuite entrepris la cartographie et la description des roches cuivrées du bassin du lac supérieur. Les années Forma-tives du fils, John, ont été passées

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. Transactions. he Ohio Survey under Dr. Newberry. The work in Ohiowas largely performed during the vacations of the University of Wiscon-sin, to whose chair Roland Irving was called in 1870. Later, his residencein Wisconsin led to two events of prime importance in the history ofAmerican geology. He began the study of the Gogebic iron range andcaught the clue to the origin and stratigraphy of the iron ores of all theLake Superior ranges; and he later undertook the mapping and descrip-tion of the copper-bearing rocks of the Lake Superior basin. The forma-tive years of the son, John, were passed in a home where the father, 736 BIOGRAPHICAL NOTICES Roland, was preparing the now famous monographs on these two sub-jects. Not alone did Johns father work upon their preparation, but theskilful hand and fine sense of color of his mother were placing on paperthe beautiful illustrations of the microscopic mineralogy of the copper-bearing rocks, and all in the very early days of microscopic rock study inAmerica.. Captain John Duer Irving. In Johns fourteenth year, illness, preying on a constitution neverover-strong, deprived him of his father, and left him the almost sacredduty of following in the footsteps and continuing the work of one inter-rupted at thirty-nine in mid-career. Mrs. Irving removed to the Eastamong her kinsfolk and John was prepared for Columbia College to rep-resent the fourth generation of his name upon the alumni rolls. Hisboyhood period passed and his college and university life began. BIOGRAPHICAL NOTICES 737 He entered in 1892 and took the prescribed courses of the time.The vacation of 1895, following his junior year, was passed with one ofProfessor Osborns parties in searching for Tertiary vertebrates in theBrowns Park beds of northeastern Utah. On the observations thereobtained was based the first contribution of John Irving to geologicalliterature. Following his senior year, he went with the writer to the Adi-rondacks and had a month or two of experie

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