District school libraries form a very modern part of the general system, having been first suggested by Governor Clinton of New York in 1827, and introduced by law in 1835. Since then twenty other States have adopted the plan, but some, like Massachusetts, have abandoned it for that of town libraries. The greatest difficulties it labors under are found in country districts, where the funds are applied to other purposes, and the books are recklessly lent out and lost, both evils being due to the fact that few persons can be found who are able and willing to keep the work in good order. In cities the success of these district libraries is much greater. They now report an aggregate of 1,270,497 books, but their statistics are very incomplete. College libraries are among the most important in the country, that of Harvard being the largest we have, after the Congressional library in Washington. As to asylum and reformatory libraries, it would be hard to find circumstances under which books could be more usefully collected than in those institutions, where in 1870 32,901 prisoners were confined, and 116,102 paupers housed habitually or at times. If we consider that only one-fifth of the criminals are in jail, and allow for the natural increase of criminals and paupers, it will be apparent that the population which may derive benefit from these libraries must now number at least 300,000 persons. To meet their wants there are 206 libraries, with 223,197 volumes. The Pennsylvania State Penitentiary has the largest collection, 9,000 volumes, besides 1,000 school books. The other end of the line is occupied by Florida, which maintains 40 volumes in its Penitentiary. Some interesting information has been gathered concerning the literary taste of convicts. Story books, magazines, and light literature generally are the favorite choice, but history, biography, and travels are also well patronized. In the Massachusetts State prison Humboldt's "Cosmos" and other philosophical works are called for. In fact the value of prison libraries is vouched for by all authorities, and one says that no convicts, except those really idiotic, leave a prison where there is a library without having gained some advantage. The greatest defects in the system are the lack of books and of light to read them by at night. There are but forty prison libraries, with 61,095 volumes, and in American prisons the cells are not lighted. Lights are placed in the corridors so that only a small number of the inmates have light enough to read by. The Joliet (Ill.) prison is a cheering exception to this gloomy state of things. Each cell has its own catalogue, and lights are allowed up to nine o'clock. Public charities of several kinds have lately suffered from exposures that prevent charitably disposed persons from giving aid which they would otherwise gladly contribute. It may be useful to suggest that money sent to any prison for the benefit of its library could hardly fail to be helpful.