While he was preparing for his critique of political economy, Marx produced an enormous quantity of excerpt notebooks. Sometimes accompanied by his own comments, they largely consist of direct quotes from various books, journals, and newspaper articles that attracted his attention. Although they were neglected among Marxist scholars for quite a long time without publication in any languages, these notebooks, in addition to the manuscripts and letters, constitute an invaluable original source for understanding Marx's thinking process.… Marx's notebooks record his ceaseless efforts to grasp the totality of capitalism, and, since Capital remains unfinished, they provide useful hints for speculating how Marx would have completed his project of critique of political economy.… As an attempt to comprehend the development of Marx's theory through his notebooks, this paper analyzes his excerpts from books by two agricultural chemists, Justus von Liebig and James F.W. Johnston, in order to reveal a significant modification in regard to Marx's attitude towards modern agricultural practice, which led his to study the natural sciences even more intensively in his late years.
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