86 The American Geologist. February, 1892 
1858. During the winter of 1857-58 he delivered a series of 
public lectures, by request of the Young Men’s Association of 
Ann Arbor, in the hall of the Union school, Except the public 
geological lectures of Dr. Douglass Houghton, in Detroit, this was 
the first presentation, before public audiences of the state, of the 
popular truths of geology. The final lecture, entitled, Creation 
the work of one Intelligence, and not the Product of Physical Forces, 
was published in pamphlet form by the Association. | This was 
inspired, confessedly, by Agassiz’ splendid Lssay on Classi fica- 
tion, in the sentiments of which he felt a profound sympathy. 
In May, 1858, he published, for the use of his students a Synop-- 
tical view of the Succession of Organic Types, which went through 
three editions. He carried through the Michigan Journal of Edu- 
cation a series of nine popular articles under the general heading 
Leaves from the Book of Nature. During the summer he visited 
Missouri, and held a quasi-connection with the geological survey 
then in progress under Prof. Swallow, sending to the Ann Arbor 
papers some account of what he saw. 
1859. In January, 1859, he memorialized the State Legisla- 
ture on the subject of a geological survey (House Document No. 
29); and the survey having been ordered he was commissioned by 
Gov. Moses Wisner, as director. On the 16th of May he set out, 
with a camp-outfit and one assistant, A. D. White, for the per- 
sonal examination of the southern portion of the Lower Peninsula. 
He served this year also as editor, and against his will, as pub- 
lisher of the Michigan Journal of Education, to which he con- 
tributed numerous articles and criticisms—among them a popular 
solution of the celebrated ‘‘Pendulum, Problem.” As president 
ot the State Teachers’ Association he managed its interests, and 
delivered the annual address on What Coustitutes the Successful 
Teacher, In October, having, during the season, studied the geo- 
logical relations of the various brine springs of the state, he pub- 
lished, in one of the Grand Rapids papers, a general conclusion 
from which he never had occasion to recede. He discouraged the 
attempt to produce salt at Grand Rapids. His exploration of the 
Saginaw region enabled him to locate the salt formation at the 
depth of 650 feet beneath Kast Saginaw. This was before the 
first well was bored. Experiment revealed the existence of a sup- 
ply of brine at 648 feet. As, during the same season, he had to 
oversee the erection of his new residence, costing about ten 
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