Contents or Abstract: '; “...The surveys of Lieutenant Fremont, 1842-48 (p.158) -- Emory's Mexican War reconnaissance, 1846 (p.160) -- The surveys of Simpson and Sitgreaves, 1849-51 (p.162) -- The surveys of Ives and Macomb, 1857-59 (p.164) -- The great railroad surveys, 1853-55 (p.166) -- Artists and scientists of the Great Pacific Railroad surveys (p.168) -- The great surveys. ...”