July 19, 1895.] 



SCIENCE. 



59 



and to study the geologic conditions affectiag 

 underground waters on the Island, and 

 several trips were made to Baltimore with 

 a similar object in view. 



In southwestern West Virginia field work 

 was prosecuted nearly all the month by Mr. 

 Mendenhall, Mr. M. R. Campbell's assis- 

 tant. Mr. Mendenhall was revising the 

 Tazewell sheet. Having completed his 

 office work, Mr. Campbell himself took the 

 field about the 10th, at Alderson, in the 

 same State. From Alderson he and his 

 party worked down New Eiver, studying the 

 conglomerate series as far as Kanawha 

 Falls. From that point they moved to the 

 eastern edge of the Kanawha sheet. Mr. 

 David White was of the Campbell party. 

 He was rendering assistance in the corre- 

 lation of the different horizons, mainly by 

 the testimony of the plant remains. 



Mr. Arthur Keith confined himself to 

 ofiBce work, making a preliminary draft of 

 the boundaries of the coal formations on 

 the Briceville and Wartburg sheets of Ten- 

 nessee, and preparing for field work, which 

 he has since taken up. Mr. C. Willard 

 Hayes took the field the latter part of the 

 month in Alabama and Georgia. Mr. K. 

 T. Hill is engaged in the completion of 

 the Austin sheet of Texas. 



Mr. G. K. Gilbert, geologist, spent the 

 first half of the month in the continued 

 prosecution of his work at Niagara Falls, 

 mentioned in the last report. The object 

 of this work was to obtain further knowl- 

 edge of the details of the history of the Ni- 

 agara Eiver and the data for the illustration 

 of a report thereon. Completing his task 

 on the 15th, he returned to Washington and 

 was subsequently engaged in the study of 

 the literature of the geology of Niagara 

 Falls and that relating to the associated 

 problems of ice- dammed lakes. 



Prof. T. C Chamberlin, geologist, reports 

 from the University of Chicago that Mr. 

 Leverett continued the preparation of a re- 



port uj)on the glacial geology of the Illinois 

 lobe, making short excursions into the field 

 in connection with that work. Prof. R. D. 

 Salisbury did some work iu Pennsylvania 

 and New York, in continuation of surveys 

 made in past years in New Jersey. 



The work in the Lake Superior region, 

 under Prof. C. R. Van Hise, was in all re- 

 spects a continuation of that of the previous 

 month. Dr. Bayley continuing the prepara- 

 tion of the Marquette monograph ; Mr. 

 Clements the preparation of the Michi- 

 gamme monograph, and Mr. Morrow the 

 cartographic work. The head of the party 

 gave his time exclusivelj' to the preparation 

 of the paper for the Sixteenth Annual Re- 

 port of the Survey. 



Office work relating to the geology of the 

 mining districts of Colorado was continued 

 by Mr. Whitman Cross and Mr. G. H. El- 

 dridge, and also, during the last ten days 

 of the month, by Mr. S. F. Emmons. Mr. 

 Emmons and Mr. Spurr were occupied in 

 revising the manuscript of a report on the 

 Murcur mining district. 



Mr. Cross was engaged in preparing the 

 report on the geology of the Cripple Creek 

 district, a task which he has, since the close 

 of the month, brought to completion. This 

 paper will appear in the Sixteenth Annual 

 Report. Mr. Eldridge continued the final 

 revision of the Denver report. Messrs. 

 Cross and Eldridge are about to take the 

 field. 



During May the maps and descriptive 

 text constituting the Yellowstone Park folio 

 were brought to completion, a number of 

 additions having first been made to the 

 sheets which, Mr. Hague thinks, will greatly 

 enhance their value and interest. The 

 folio is now ready for publication. Mr. 

 Hague is now at work on the monograph 

 on the geology of the Yellowstone Park. 

 Mr. W. H. Weed, geologist, continued of- 

 fice work on the preparation for publication 

 of the Little Belt sheet. On the 25th, un- 



