Professor Herrick's comprehensive treatise on the causes and conditions of white servitude in Pennsylvania in the 18th century covers the demand for redemptions, the home supply of indentured servants, the sources of the supplies of British and German servants, and the conditions of transportation from recruitment abroad, through the transatlantic voyage, to the role of the immigrant aid societies in Pennsylvania. Herrick also goes over the provincial laws pertaining to white servitude and provides a detailed discussion of the indentured and redemption labor system in operation.