MEMORIAL OF J. D. IRVING 39 



professorship he continued up to the time of his death, as he was on leave 

 of absence from the university while serving with his regiment. 



During his years of teaching Doctor Irving amplified his already ex- 

 ceptionally extended field experience by work in mining geology of a pro- 

 fessional nature, and in this way was enabled to visit Alaska, Montana, 

 and Idaho. He attended the International Geological Congress in Stock- 

 holm in 1910, and thus enjoyed the exceptional opportunities afforded by 

 the Congress to see the ore deposits of Sweden. AYhile in Europe for the 

 Congress, he traveled also on the continent with his friend Waldemar 

 Lindgren, with whom he prepared a paper on Eammelsberg, as the result 

 of their joint visit. Thus in his work as teacher, John Irving drew on a 

 wide and varied experience and on extended personal observation made 

 both as scientific man and as engineer. To an exceptional degree, there- 

 fore, he was able to meet the requirements of a professorship in a tech- 

 nical school and of the courses in the applications of geology, which are 

 now much sought and are among the most important offered in the cur- 

 ricula of our universities. In the inevitable vocational developments of 

 college and university instruction which will accompany the reorganiza- 

 tion after the upheaval of the war he will be greatly missed, since he 

 combined in high degree the ideals of accurate and unselfish work with 

 the good sense of the engineer. 



In 1905, while John Irving was yet at work at Lehigh University, the 

 plan was developed of establishing a magazine which might be the special 

 means of expression and record for the vigorous young school of Amer- 

 ican students of ore deposits and applied geology, which had then become 

 a marked feature of our scientific life. We gathered a little band ready 

 to maintain such a journal through what was anticipated would be two or 

 three years of financial struggle for self-support. John Irving was chosen 

 as editor, and to his untiring efforts, ably aided by the unselfish work of 

 W. S. Bayley as business manager, we chiefly owe the thirteen volumes 

 of this valuable and interesting journal. ISTo one can turn its pages with- 

 out a feeling of admiration for the succession of contributions which it 

 contains. As we look the volume over, we note also the subjects which 

 especially appealed to the active and philosophical mind of the editor. 

 His work in the mining districts emphasized the importance of ore-shoots 

 and local places of value in veins, and he seeks to classify and svstematize 

 their causes. He is again impressed with the importance of a compre- 

 hensive study of special problems wherever one particular case of them 

 may be illustrated, as contrasted with the generally localized investiga- 

 tions carried on by one individual. His extended experience at Leadville 

 in the mines, where S. F. Emmons made the illuminating application of 



