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It üs now universally recognised ae a fundamental principle in historical ^work that philological criticism (literary and quellenkritisch) is the neoeessary preparation for a satisfactory use of authorities. The sections rellating to the Croatians and Servians, Magyars and Patzinaks, the Iberians and their neighbours can be extracted and printed äs indlependent documents.1) The result has been that the treatise has nofc been studied äs a whol$.
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The treatise lends itself to piecemeal treatment. The precious and uniique notices bearing upon Slavonic and Hungarian history have been microscopically scrutinised by the curiosity of Slavonic and Hniigariaan investigators, eager to penetrate the darkness which envelopes the early fortunes of their races and others have joined them in the seamh. The treatise of the Empieror Constantine VII, known by the inappropriate title with whicb its first editor Meursius endowed it, De administrando imperio, has bteen in parts äs diligently studied äs any document of Byzantine literatture. It contains a wide variety of information on both foreign relations and internal administration and is one of the most important historical documents.