72 GEOLOGICAL SURVEY OF WISCONSIN. 



The resignation of Prof. Daniells. however, as chemist to the survey, 

 was accepted after due deliberation, and the undersigned appointed in 

 his place Mr. Gustavus Bode, of Milwaukee, whose acknowledged 

 eminence in his scientific speciality was a guaranty of peculiar fitness 

 for the work entrusted to his care and skill. 



Mr. E. T. Sweet, who had been connected with the survey from the 

 beginning, a trained geological observer, an experienced practical 

 chemist, was employed in a general way, to be transferred from one 

 field party to another, or to be detailed to the laboratory of the State 

 University for special analytical work. 



Mr. Sweet has shown himself very efficient in connection with Prof. 

 Irving's party, in connection with the party of the chief geologist in 

 making an extensive reconnoissance of the northern portion of the 

 state, and in the labor of the laboratory. 



Mr. Charles E. Wright, of Marquette, L. S., Michigan, a partner 

 as mining engineer and iron expert of Maj. T. B. Brooks, with whom 

 he was engaged on the geological survey of the upper peninsula of 

 Michigan, was employed during two months in making explorations 

 at Penokee Gap, on the Chippewa, Wisconsin, Pelican and Wolf 

 rivers, under the personal supervision of the undersigned. His ex- 

 perience among crystalline rocks, his knowledge of the Laurentian 

 and Huronian formations, and his skill in detecting under the micro- 

 scope the difference between crystallization by igneous action and met- 

 amorphosis, made his services of especial value in a reconnoissance of 

 the Archaean region of Wisconsin. 



RECONNOISSANCE MADE IN THE NORTHERN PART OF THE STATE UNDER 

 THE PERSONAL DIRECTION OF THE CHIEF GEOLOGIST, DURING THE LAT- 

 TER PORTION OF THE SEASON OF 1875. About the middle of August 

 the state geologist began an extensive reconnoissance of the northern 

 portion of Wisconsin, for the general purpose of ascertaining the na- 

 ture and amount of work to be done to complete the survey in 1876. 

 The reports of the surveys made by Dr. Owen and by Messrs. Foster 

 and Whitney, were carefully studied and extensive notes taken, for 

 the purpose of having a sort of geological guide book of the region, 

 and for the purpose of avoiding an unnecessary repetition of work 

 already performed and recorded. Maps, camping materials, supplies, 

 instruments, etc., were collected beforehand, and all preparations 

 made for moving as rapidly as possible, and covering the greatest 

 amount of territory in a given time. 



Mr. E. T. Sweet, a seasoned explorer, a good geological observer, a 

 hardy and enthusiastic worker, who had had experience in the north- 



