762 THE JOURNAL OF GEOLOGY. 



needed only an introduction to. some of the many fascinating 

 and alluring problems of Nature to become a zealous searcher 

 after her hidden laws. He was the fortunate possessor of good 

 judgment and a logical reason, and exhibited an energy that was 

 constantly taxing his physical endurance. 



With this endowment he entered Amherst College, and in 

 time became attracted toward geology, remaining after gradua- 

 tion to pursue its study with Professor Emerson ; then to Europe 

 where he visited regions that had become geologically classic ; 

 settling in Heidelberg to devote himself to microscopical petrog- 

 raphy under Professor Rosenbusch ; acquiring at the same time 

 a knowledge of crystallography and mineralogy. Graduating 

 from Heidelberg in 1882, he returned to this country to find an 

 opening for his stored-up energies in the Johns Hopkins Univer- 

 sity, where he undertook the labors of an Associate in 1883, 

 being made Associate Professor in 1885. From this time on he 

 led his dual life of teacher and investigator, apparently as eager 

 to pursue the one line of activity as he was to carry on the other. 

 And while they maintained the closest relationship to one 

 another, proceeding conjointly, they may without violence be 

 considered separately. 



As a teacher he was eminently successful, judged by the 

 interest taken in his courses, and by the character of the stu- 

 dents who have graduated in his department, and who now 

 occupy honorable positions, both in the faculties of universities 

 and on the staffs of geological surveys. His methods were 

 advanced and rational. The liberal use of laboratory practice 

 and frequent excursions into the surrounding country brought 

 his pupils in contact with problems as they exist in Nature. And 

 the actual investigations they were themselves able to carry on 

 under his direction rendered them not merely hearers of his 

 words but doers of them ; acquiring experience and self-reliance 

 that enabled them to enter at once upon new fields of geological 

 activity. 



His influence as a teacher was not limited to his classes, but 

 reached a much larger audience through the medium of his 



