MEMORIAL OF O. II. SAINT JOHN 37 



immediately entered on his new duties in Iowa with great industry and 

 enthusiasm. 



During the four years that he was engaged thus he got out several very 

 creditable reports — one on the Middle Coal Measures regions, which was 

 virgin territory, and short accounts of the mineral resources and geology 

 of fifteen counties in the western half of the State. His efforts extended 

 much further. As Doctor White stated, Saint John was properly to be 

 regarded joint author of the report of Northwestern Iowa, and on the 

 Gypsum Deposits. Besides, his artistic faculties were put to wide use in 

 the preparation of all the maps and illustrations of the two final volumes 

 published by the Survey. 



A number of minor memoirs emanated from this work. These were 

 chiefly descriptions of new forms of fossils and mainly appeared under 

 the joint authorship of White and Saint John. 



It was during this period that he became intimately acquainted with 

 Otto Theime, James Love, Charles Wachsmuth, Frank Springer, and 

 other of the Burlington collectors, Amos Worthen, of Warsaw, Illinois, 

 and the Missouri and Kansas geologists. He took all of their fish col- 

 lections and gave them in return all the crinoids and other fossils which 

 he collected. 



On the completion of his duties on the Iowa Geological Survey, Saint 

 John accepted the chair of natural history in the Iowa State Agricultural 

 College, at Ames, then just organized. This post he held only one year, 

 being called to Illinois by State Geologist Worthen to work up and de- 

 scribe the fossil fishes of that State, of which large collections had already 

 been made. An elaborate report, accompanied by many plates, was pub- 

 lished as volume VI of the Illinois Geological Survey. 



In 1872 Saint John went back to the Museum of Comparative Zoology 

 to continue his work with Professor Agassiz. He remained with the 

 latter until his demise, two years later. In Cambridge he now found 

 Wachsmuth, who was working on the fossil crinoids, beginning that in- 

 vestigation which a quarter of a century afterward flowered into that 

 monumental monograph on the subject. There Saint John also con- 

 tinued his studies on the Illinois fossil fishes, with the result of another 

 fine monograph, which was incorporated in volume VII of the Illinois 

 Geological Survey. 



On the death of Agassiz, Saint John removed to Topeka, Kansas; but 

 he was soon again engaged in geological field-work on the Hayden United 

 States Geological Surveys of the Territories, carrying on operations first 

 in New Mexico and Idaho and then in Wyoming and Colorado. 



The first investigations were on the Coal Measures of northeastern 



