On the Origin of Species by Means of Natural Selection; or, the Preservation of favored Races in the Struggle for Life. By Charles Darwin, M.A., F.R.S., F.G.S., &c., &c. 1 vol. 12mo. With copious Index. Cloth, $1 25.

After the Icebergs with a Painter. By Louis L. Noble. 1 vol. 12mo. With Illustrations. (Nearly ready.)

The Manufacture of Photogenic or Hydro-carbon Oils, from Coal and other Bituminous Substances, capable of supplying Burning Fluids. By Thomas Antisell, M.D., Professor of Chemistry in the Medical Department of Georgetown College, D. C., &c., &c. 1 vol. 8vo. Beautifully printed. Cloth, $1 75.

Considerations on some of the Elements and Conditions of Social Welfare and Human Progress. Being Academic and Occasional Discourses and other Pieces. By C. S. Henry, D.D. 1 vol. 12mo. $1.

Science Brought Down to the Year 1860. Being a Supplement to Ure’s Dictionary of Arts, Manufactures, and Mines. Taken from the English Edition. With additions by an American Editor. (Nearly ready.) 8vo.

Milledulcia: a Thousand Pleasant Things. Selected from “Notes and Queries.” 12mo. Cloth, top edge gilt, $1 50; in half calf, $3; morocco antique, $3 50.

Chambers’s Encyclopædia: a Dictionary of Universal Knowledge for the People. Now publishing in Parts. Part 19 now ready. Price 15 cents each Part.

A Greek Grammar, for Schools and Colleges. By James Hadley, Professor in Yale College. 12mo. 366 pages. $1 25.

Virgil’s Æneid; with Explanatory Notes. By Henry S. Frieze, Professor of Latin in the State University of Michigan. 12mo. Eighty-five illustrations. 598 pages. $1 25.

Spanish Grammar. A New, Practical, and Easy Method of Learning the Spanish Language, after the system of A. F. Ahn, Doctor of Philosophy, and Professor at the College of Neuss. First American edition, revised and enlarged. 12mo. 149 pages. 75 cents. Key, 15 cents.