The little treatise which follows is in a manuscript of the Marciana at Venice—gr. fondo antico, 173 (late twelfth century). It throws considerable light on the system of taxation in the later Empire, and explains a good many technical terms which one meets with in the documents. So far as I know, it has never been published. Even if it has, it deserves to be published again. I hope in a future number to say something of its contents. I have numbered the paragraphs for convenience of reference. The treatise begins on f. 276 v. of the manuscript. I reproduce the spelling and accentuation of the manuscript. In some cases I may have gone wrong in enlarging the abbreviations, which are numerous.