John Marsh graduated from Harvard in 1823. He taught in Minnesota, became an Indian agent, traded furs and, without having studied medicine, practiced as a physician in Los Angeles in 1836. Later he became a cattle baron, helped to get California into the union, discovered gold and was finally murdered. Thus, he lived an exceedingly interesting life. Apparently, Marsh used chiefly brandy and quinine in his treatment. He also practiced obstetrics without too great a contribution to the mortality rates. The medical interest of the book is slight, but as a contribution to early American records it is valuable. The author is a physician who has been especially interested in the history of California.