Interesting article over at Marx. Dialectical Studies:
Given the general way that Marx’s work was understood in the twentieth century, it would have been shocking for many to find out that the author of The Communist Manifesto and Capital, volume 1 had engaged in an intensive study of geology –- and whose notes of excerpted material now comprise nearly 657 printed pages. The excerpts include many complex drawings and extended chemical and statistical tabulations; there are, however, scarcely any of Marx’s own remarks in the notes.Why did he do this, instead of completing volumes 2 and 3 of Capital? Was he already too ill at the age of 60 for serious theoretical labour? Did he like to divert himself? Was he tired of political economy? To ask such questions means to misunderstand Marx. For on the one hand there always are conditions of nature connected with labour, and on the other hand geological and agrochemical issues which were connected with ground rent and thus with the further development of Capital, volume 3.