9. Connection of cotton and slavery. [Hammond, 34-66.]
10. The cotton trade, 1815-1860. [Hammond, 243-277.]
11. Rice culture before the Civil War. [Depew, chap. 38 by Talmage; DeBow, vol. 2.]
12. Later history of American fisheries, and international questions to which they have given rise. [Census; McMaster and Moore in Cambridge Mod. hist., vol. 7, 363 ff., 657 ff.; Carnegie History, vol. 2, part 2.]
13. Trade in turpentine and rosin. [Census, 1900, 9: 1001-1012.]
14. The development of the American lumber industry. [Depew, chap. 30, by Fernow.]
15. Development of Cincinnati or Chicago as a market for meat and breadstuffs. [Local histories.]
16. What countries were the chief sources of supply of gold and silver before 1850? [Encyclopedias.]
17. The California gold discovery. [Narrative histories of U. S.]
18. Commerce of California before the discovery of gold. [Read the interesting narrative of a sailor’s life by R. H. Dana, Two years before the mast, Boston, Houghton.]