The military history of the Napoleonic period has received a new contribution in the _War of 1806 and 1807_, just published at Berlin, by Col. Hoepfner, in two volumes. It is prepared from documents in the Prussian archives, and illustrated with maps and plans of battles. Not only does it add to our previous stock of information as to the military operations in Germany during these eventful years, but it serves at the same time as a history of the dissolution of that state which Frederic the Great erected with such labor and perseverance. We have here, in short, a picture of the downfall of the old Prussian military-system. * * * * * A new work on FRENCH HISTORY during the middle ages is _La France au temps des Croisades_, by M. Vaublanc, which has lately made its appearance at Paris, in four handsome octavo volumes. It is the fruit of long and conscientious researches, and is written in a style of seductive elegance. The author is no dry chronicler, or plodding statician, but an artist, fully alive to the picturesqueness of his topic. He carries his reader with him into the time and the scenes he describes, and makes him a participant in the romantic and adventurous life of the period. His book is thus as entertaining as it is instructive. * * * * * A convenient book of reference for those who deal with the more recondite and interesting questions of history is the _Statistique des Peuples de l'Antiquite_, by M. Moreau de Jonnes, just published at Paris. It is a work of great erudition and even originality. All sorts of facts as to the social condition of the Egyptians, Hebrews, Greeks, Romans, and Gauls, may be gathered from it. Another new work of a similar character is entitled _Du Probleme de la Misere et de sa solution chez tous les Peuples Anciens et Modernes_, by M. Moreau Christophe. Two volumes only have been published; a third is to follow. Price $1.50 a volume. * * * * * A translation of M'CULLOCH' _Principles of Political Economy_ has appeared at Paris, in four vols. 8vo. The translator is M.A. Planche. * * * * *