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In 1858 he was appointed State Geologist of Illinois by Gov. 

 W. H. Bissell; and in connection with this office he performed 

 the work which has been of so much honor to himself and 

 credit to the State. From the time of his appointment, to the 

 end of his life, he devoted himself to the State of Illinois almost 

 exclusively, for he found there an ample field, not only for his 

 own labors, but for those of all the assistants whose services 

 he could obtain. 



Upon entering upon the duties of his office he quickly com- 

 prehended the magnitude of the task that lay before him, and 

 he began to gather about him men skilled in various branches 

 of scientific work, among whose names are many that are 

 familiar to the whole scientific world. The following is a list of 

 those who have aided him in his work, and who have con- 

 tributed their writings to his reports and other publications: 

 Bannister, Dr. H. M. Lesquereux, Dr. Leo 



Barris, Prof. W. H. Meek, F. B. 



Blaney, Dr. J. V. Z. Miller, S. A. 



Bradley, Prof. F. H. Newberry, Prof. J. S. 



Broadhead, Prof. G. C. Prout, Dr. H. A. 



Cope, Prof. E. D. Scudder, S. H. 



Cox, Prof. E. T. Shaw, James 



Englemann, Henry Springer, Frank 



Everett, Dr. Oliver St. John, Prof. Orestes 



Freeman, H. C. Ulrich, E. O. 



Green, H. A. Wachsmuth, Charles 



Whitney, Prof. J. D. 



After his field work upon the State Survey had been accom- 

 plished, Professor Worthen was appointed Curator of the State 

 Historical Library and Natural History Museum. In connec- 

 tion with the duties of this office he continued the preparation 

 of the remaining results of his work on the survey for publi- 

 cation, which have appeared in Bulletin No. 1 of the Museum, 

 and in the two last volumes of his great series. 



The following is a list of the works which have been pub- 

 lished by him, portions of which have appeared under his name 

 alone, and other portions under the names of certain of his 

 assistants respectively; but his name appears as joint author 

 of the greater part of the work of his assistants. 



