CONTENTS. 
JILY NUMBER. 
On Psammichnites and the early trilobites of the Cam- 
brian rocks in eastern Canada. G. F. Matthew. . . 1 
Palasontologic and stratigraphic "principles" of the ad- 
versaries of the Taconic. Jules Marcou 10 
On some fossils from the lower coal measures at Des 
Moines, Iowa. Charles R. Keyes 23 
On some investigations regarding the condition of the 
interioi* of the earth. E. W. Claypole. . /. 28 ^ 
The post-glacial geology of Ann Arbor, Mich. C. W. 
WOOLDRIDGE 35 
A correlation of the lower Silurian horizons of Tennessee, 
and of the Ohio and Mississippi valleys with those 
of New York and Canada. E. 0. Ulrich 39 " 
Geology as a means of culture. Alexander Winchell. 44 
Editorial Comment. — The antiquity of man ; some incidental results of the 
discussion, 51. 
Review of Recent Literatiire, 54.— Considerations sur les fossiles decrits 
cornme Algues. G. Maillard, 54.— Synopsis of the flora of the Lar- 
amie group. Ward, 56. — ( >n an Arcbtean plant from the white crystal- 
line limestone of Sussex county, N. J. Brittok, 58.— Geological 
survey of Ohio, vol. vi; Economic geology. Orton, 58. 
Correspondence.— The Huronian of Canada. " A. R. C. Selwyn, 61.— Lake 
beaches at Ann Arbor. F. W. Spencer, 63. — Dr. Clark's collection 
of fish remains at Berea, O. E. W. Claypole, 62.— Geyserite vs. vol- 
canic dust, in Nebraska. L. E. Hicks, 64.— The so-called marine 
beaches of Long Island. John Bryson, 65. 
Personal and Scientific News, 65. — Al innesota Academy of Natural Sciences. 
— Geological map of Europe. — Publications of the International Geo- 
logical Congress. — The late professors Wright, VVorthen and Irving. 
— The appointments of Drs. Wadsworth and Lindahl. 
AUGUST NUMBER. 
Palaeontologic and Stratigraphic ''principles " of the ad- 
versaries of the Taconic. [ii.] Jules Marcou. . . 67 
Some remarks on the present state of our knowledge of 
the North American eastern Tertiary. Otto Meyer, 
Ph. D 88 
Geology of the Montmorenci. [From the American Mag- 
azine, 1847.] Ebenezer Emmoxs, M. D 94 
Geology as a means of culture, [ii.] Alexander Win- 
chell 100 
Prof. Amos H. Worthen. *E. 0. Ulrkh. [Portrait.]. . 114 
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