An excellent result of the establishment of summer schools has been the interchange of the teaching forces of colleges and universities; and on a minor scale the employment of strong secondary school men in summer college courses. Much has been made of the international exchange of professors recently brought about; but unconsciously within our own country there has been established a custom which must prove very valuable not alone to institutions inviting outside instructors, but also to those instructors themselves, and to their own institutions. Thus, taking the history men alone last summer Harvard was represented at the University of California, Yale at Wisconsin, Leland Stanford at Kansas; Columbia at Chicago, Wisconsin at Illinois, University of the South at Michigan, Indiana University at Cornell; Michigan at Chicago; Brown at Harvard, and Pennsylvania at Columbia. Such an exchange of instructors cannot but bring about a mutual education; and when it is remembered that the same policy of exchange is going on in many other subjects than history, it will be seen that we have here a great power for good. * * * * * Messrs. Ginn & Co. are continuing the excellent undertaking of furnishing source-material for history teachers and scholars, which they began so auspiciously with Prof. Robinson’s “Readings in European History,” and followed with Robinson and Beard’s “Readings in Modern European History.” Professor Cheyney’s “Readings in English History” was reviewed in the September number. The same publishers now announce two new books: “Selections from the Economic History of the United States, 1760-1860,” by Professor Guy S. Collender, of Yale University; and “Readings on American Federal Government,” by Professor Paul S. Reinsch, of the University of Wisconsin. An “American Historical Series” made up of text-books that will be comprehensive, systematic and authoritative, is announced by Messrs. Henry Holt & Co., the publishers of the well-known “American Science Series.” In the new series Professor Colby, of McGill University, will prepare a book on Mediæval and Modern Europe, and one on the Renaissance and Reformation. Professor S. B. Fay, of Dartmouth College, is at work upon a volume entitled, “Europe in the XVII and XVIII Centuries;” Professor R. C. H. Catterall, of Cornell, will treat of the “French Revolution and Napoleon;” and Professor C. D. Hazen, of Smith College, will write the volume upon “Europe in the Nineteenth Century.” There will be also a history of the United States by Professor Frederick J. Turner; a history of Greece, by Professor Paul Shorey; and a history of Rome, by Director Jesse B. Carter. * * * * * A LIBRARY OF History and Exploration Invaluable for Every School. The Trail Makers Prof. JOHN BACH McMASTER, Consulting Editor. Each Volume Small 12mo. Cloth. Illustrated. With Introductions, Illustrations and Maps. 17 volumes. Each $1.00 net.