STATE GEOLOGIST 25 



predict with considerable confidence the depth at which the 

 salt I Grand Rap 1 be reach d. The 



lequenf reanlj tppilj juatified my judgment, and we 



enabled toaaj I • 1 ok upon one of the leading enterpric 

 - Lte as tlu' ical ge< 



- >me time on the Flint und Saginaw 

 imeroua lakes and streams of Oakla 

 . ipeer and Washteo 



paid a visit to th< 

 the State. He was accompanied during- most of thi d by 



Mr. f Flint, and for a few week? by Dr. Jewi 11, of Ann 



Arbor. While in the vicinity of Flushing, in G 

 hi collected valuable observations and ins from the 



jrop of the coal series; and these have been communicate 1, 

 with proper diagrams, to this department. 



In December, I entered upon a comparative examination of 

 Michigan and Ohio gypsum. A chemical analysis of each was 

 made, at my request, by Prof. L. R. Fisk, of the Agricultural 

 College; and at the instance of C. A. Trowbridge, Esq., of De- 

 troit, I drew up a paper on the subject, which was placed in his 

 hands. 



In the month of February, 18G0, I paid a visit, by request, to 

 the salt woi and Rapids. 1 collected information, and 



explained the ii. I, in the light of the geological observa- 



tions winch I had made in the southern part of the State ; and 

 while there, deliver* d a public lecture upon the subject of Salt 

 and r ' Halations. 



About the firs! of- March, 1 drew up a paper embracing a 

 brief exhibit of the geology of the southern peninsula, and a 



• of the borings at various localities for salt. 



Th Dr. Potter, the Superintendent of the salt 



inaw, for the purpose of informing the 



• ipanv which he represented, as to t. ^ical position 



wh I boring had reached, and what might be ex- 



p<" tasequence of continuing to greater depths. For 



