Volume II proves the unparalleled conscientiousness and strict

self-criticism which he practised in his endeavour to fully elaborate his great economic discoveries before he published them. This self-criticism rarely permitted him to adapt his presentation of the subject, in content as well as in form, to his ever widening horizon, which he enlarged by incessant study.

'The material ... consists of the following parts: First, a manuscript entitled "A contribution to the Critique of Political Economy", containing 1,472 quarto pages in 23 divisions, written in the time from August, 1861, to June, 1863. It is a continuation of the work of the same title, the first volume of which appeared in Berlin, in 1859.... This manuscript, valuable though it is, could not be used in the present edition of Volume II.

'The manuscript next following in the order of time is that of Volume III....

'The period after the publication of Volume I, which is next in order, is represented by a collection of four manuscripts for Volume II, marked I-IV by Marx himself. Manuscript I (150 pages) presumably written in 1865 or 1867, is the first independent, but more or less fragmentary, elaboration of the questions now contained in Volume II. This manuscript is likewise unsuited for this edition. Manuscript III is partly a compilation of quotations and references to the manuscripts containing Marx's extracts and comments, most of them relating to the first section of Volume II, partly an elaboration of special points, particularly a critique of Adam Smith's statements as to fixed and circulating capital and the source of profits; furthermore, a discussion of the relations of the rate of surplus-value to the rate of profit, which belongs in