IS The American Geologist. July. i89s 
Geology in its Applications to Agriculture.— Proc. Ohio Agric. Con- 
vention (1870), p. 65. 
( Icological Survey of Ohio.— Report of Progress for 1870, Part I; 
Structure of the Lower Coal Measures in Northeastern Ohio, pp. 1-53, 
4 charts. 
The Earliest Traces of Man Found in North America.— Proc. N. V. 
Lye. Nat. Hist., Vol. I (1870), p. 2. 
Ancient Lakes of Western America. — Proc. N. V. Lye. Nat. Hist., 
Vol. I (1870), p. 25. 
Geological Position of the Elephant and Mastodon in North America. 
—Proc. N. Y. Lye. Nat. Hist., Vol. I (1870), p. 77. 
On the Red Color of Sedimentary Rocks Barren of Fossils.— Proc. 
N. Y. Lyceum Natural History, Vol. I (1870), p. 30. 
The Marble Beds of Middlebury, Vermont.— Proc. N. Y. Lyceum 
Natural History, Vol. I (1870), p. 02. 
On a Cranium of Walrus found at Long Branch, N. J.— Proc. N. Y. 
Lyceum Natural History, Vol. I (1870), p. 75. 
1871. 
The U. S. Sanitary Commission in the Valley of the Mississippi dur- 
ing the War of the Rebellion.— Cleveland, Ohio (1871), 8vo, pp. 543. 
Geological Survey of Ohio.— Report of Progress for 1871, Columbus, 
Ohio, pp. 1-9. 
The Gas Wells of Ohio and Pennsylvania. — Proc. N. Y. Lyceum Nat- 
ural History, Vol. I (1871), p. 200. 
Notice of Angiospermous Leaf-Impressions in a Red Sandstone 
Boulder Found in Excavating the Foundations of a Gas Office in Wil- 
liamsburg, L I. — Proc. N. Y. Lyceum Natural History, Vol. I (1871), 
pp. 149, 150. 
1872. 
Geology of Ohio. — Gray and Walling's Atlas of Ohio, 1872, with 
geological map. 
Report on Vermont Marble.— New York, 1872, Pamphlet, 8vo, pp. 12. 
Notes on American Asphalts. American Chemist, Vol. II (1872), p.427. 
1873. 
Geological Survey of Ohio.— Vol. I, Part I; Historical Sketch, Phys- 
ical Geology, Geological Relations and Geological Structure of Ohio, 
pp. 1-167. (1873). 
Geological Survey of Ohio.— Vol. I, Part I (1873), Geology of Cuya- 
hoga County, pp. 171-200, one map. 
Geological Survey of Ohio.— Vol. I, Part I (1873), Geology of Summit 
County, pp. 201-222, one map, one plate. 
Geological Survey of Ohio.— Vol. I, Part II (1873), Description of 
Fossil Plants, pp. 355-385, eight plates. 
Geological Survey of Ohio.— Vol. I, Part II, Paleontology (1873), 
Preface, pp. 1-8. 
Coals and Lignites of the Western States and Territories. — Proc. N. 
Y. Lyceum Natural History, Second Series (1873), p. 41. 
