The third function of the state with reference to libraries is that which may be called library extension. Here the state acts directly to aid in the establishment of libraries and the extension of library work in the communities which would otherwise lack libraries. The necessity for this work has become apparent to the more progressive states of the Union within recent years. The justification of this work lies in two main reasons. First, libraries continue for the older youth of the community and for adults the education which the state requires for children. It is neither fair nor right for the state to maintain a system of education which develops a love of knowledge and of reading, and then leave the community without the means for continuing in later youth the development begun in childhood. Second, it is known that the intellectual isolation of the rural communities is one of the main reasons for the much-lamented drift from the country into the cities, and it has been found that the establishment of libraries affords one of the most important means of bringing these small communities into intellectual touch with the world. The states then which have undertaken this work of library extension have usually done so by means of the library commission. The first commission was established by Massachusetts in 1890. Seventeen states had established such commissions by the end of 1900--more than half of them in the two years preceding that date. I have no statistics regarding the establishment of such commissions in 1901. The work of these commissions may be either advisory or missionary, aiding in the establishment of libraries in the smaller communities which are able to establish and maintain them under the guidance and advice of the commission, and directly furnishing library facilities to the smallest and weakest communities. In certain states direct state aid is given to the smaller libraries, notably in Massachusetts, where each town library established under the rules of the commission receives books to the amount of $100. In some states aid is given in the purchase of books. The direct furnishing of libraries is done mainly by means of travelling libraries. So far as I can learn, these are now distributed by six states. The system has grown throughout the Union, in various manifestations, and its influence in bringing books to the communities that most lack and need them has been of the utmost value. This work is one of the greatest importance, and yet I believe it is one which will ultimately pass into the hands of the counties or smaller governmental bodies than the state.