great historians who have dealt with the Middle Ages, Gibbon or Hallam, have, as far as we have been able to discover, ever consulted them. Yet the very titles of even a few out of the very many critical dissertations appended to the "Lives of the Saints," will show how very varied and how very valuable were the purely historical labours of the Bollandists. Thus opening the first volume of the "Thesaurus Antiquitatis," a collection of the critical treatises scattered through the volumes published prior to 1750, the following titles strike the eye:--"Dissertations on the Byzantine historian Theophanes," on the "Ancient Catalogues of the Roman Pontiffs," on the "Diplomatic Art"--a discussion which elicited the famous treatise of Mabillon, "De Re Diplomatica," laying down the true principles for distinguishing false documents from true--on certain mediæval "Itineraries in Palestine," on the "Patriarchates of Alexandria and Jerusalem," on the "Bishops of Milan to the year 1261," on the "Mediæval Kings of Majorca" and no less than three treatises on the "Chronology of the early Merovingian and other French Kings." Let us take for instance these last mentioned essays on the early French kings. In them we find the Bollandists discovering a king of France, Dagobert II., whose romantic history, banishment to Ireland, restoration to his kingdom by the instrumentality of Archbishop Wilfrid, of York, and tragic death, had till their investigations lain hidden from every historian. As soon, indeed, as they had brought this obscure episode to light, and had elaborately traced the genealogy of the Merovingians, their claim to the discovery was disputed by Hadr. Valesius, the historiographer to the French Court, who was of course jealous that any one else should know more about the origins of the French monarchy than he did. His pretension, however, was easily refuted by Henschenius, who showed that he had himself discovered this derelict king twelve years before Valesius turned his thoughts to the subject, having published in 1654 a dissertation upon him distinct from those embodied in the "Acta Sanctorum." Hallam, in his "History of the Middle Ages," introduces this king, and notices that his history had escaped all historians till discovered by some learned men in the seventeenth century, for it is in this vague way he alludes to the Bollandists--and then refers for his authority to Sismondi, who in turn knows nothing of the Bollandists' share in the discovery, but attributes it to Mabillon when treating of the "Acts of the Benedictine Saints." Let us again take up Hallam, and we shall in vain search for notices of the kings of Majorca, a branch of the Royal family of Arragon, who reigned over the Balearic Islands in the thirteenth and fourteenth centuries. Let any one, however, desirous of a picture of the domestic life of sovereigns during the Middle Ages, take up Papebrock's treatise on the "Palatine Laws" of James II., King of Majorca, A.D. 1324, where