↩ The importance of Johnston and Liebig for Marx can be conceived from the fact that he read them a second time both Liebig’s Über Theorie und Praxis in der Landwirthschaft (Braunschweig: Verlag von Friedrich Vieweg und Sohn, 1856) in 1863 (to be published as MEGA2 IV/17) and Johnston’s Elements of Agricultural Chemistry and Geology , 4th ed.
L’importanza di Johnston e Liebeg per Marx può essere colta dal fatto che abbia letto una seconda volta sia Über Theorie und Praxis in der Landwirthschaft (Braunschweig: Verlag von Friedrich Vieweg und Sohn, 1856) nel 1863 (che sarà pubblicato come MEGA2 IV/17) sia Elements of Agricultural Chemistry and Geology , 4° ed.