Studies of colonial slavery are found in _Lodge's English Colonies in America_ and _Doyle's English in America_. Several special essays have been printed on slavery in Massachusetts; _Deane's_ and _Moore's Notes on Slavery_, and _Washburn's Extinction of Slavery in Massachusetts_. Little attention is in any of these works given to fugitive slaves. To another class belong books descriptive of the institution of slavery. _Mrs. Frances Kemble_ wrote about life on a Southern plantation before the war, and the _Cotton Kingdom_ and other volumes by _Frederick Law Olmsted_ give many interesting details, and furnished me with much material for the chapter on Fugitives and their Friends. =4. Biographies.= Biographies of antislavery men are likely to contain information on fugitive slave cases. The _Life of Isaac T. Hopper_ is full of accounts of his ways of aiding flight, and for the same reason the _Life of Gerrit Smith_ is exceedingly interesting. Birney's _Life of James G. Birney_ deals little with fugitives. The biographies of Mrs. Lydia Maria Child, Arthur and Lewis Tappan, John Brown, Garrison, Phillips, and the Grimké sisters, may also be mentioned. Others, like those of Jonathan Walker, L. W. Paine, Daniel Drayton, captain of the schooner Pearl, W. L. Chaplin, Work, Burr, and Thompson, and the recently published _Life of Rev. Calvin Colman_, relate simply the stories of trials and imprisonments for aiding fugitives, and are often more in the nature of original than secondary sources. =5. Original sources.= Very early in the preparation of this work it became evident that no writer had systematically examined and compared the legislation of the Colonies and States, or searched the records of Congress, or looked for contemporary accounts of any considerable number of escapes. I was therefore obliged to search for such original material as was within my reach. Doubtless some important books and pamphlets have escaped me, and an examination of other collections would enlarge the bibliography; but the effort has been made to exhaust the literature of the subject, except in newspapers. =6. Slave autobiographies.=