Sismondi's journals and his correspondence with Channing, with the countess of Albany and with others have been published mainly by Mlle Mongolfier (Paris, 1843) and M. de Saint-René Taillandier (Paris, 1863). The latter work serves as the main text of two admirable "Lundis" of Sainte-Beuve (September 1863), republished in the "Nouveaux Lundis", vol. VI. He was a historian whose economic ideas passed through different phases. The acceptance of free trade principles in "De la richesse commerciale" was abandoned in favour of a critical posture towards free trade and industrialisation. "Nouveaux principes d'économie politique" attacked wealth accumulation both as an end in itself, and for its detrimental effect on the poor. He indicated contradictions of capitalism. He criticized the harsh conditions endured by the workers from the standpoint of a liberal republican. He was also a passionate opponent of slavery. Adolphe Blanqui said of him: "No writer has shown a sympathy more notable and more touching for the working classes." Jean-Baptiste Say referred to Sismondi as "that enlightened author, ingenious, eloquent and selfless." His critique was noticed by Malthus, David Ricardo and J. S. Mill, who called his writing "sprightly, and frequently eloquent." While a young man at Edinburgh, Thomas Carlyle translated Sismondi's article on "Political Economy" for David Brewster's "Edinburgh Encyclopædia". Sismondi subsequently influenced Carlyle's views on "the dismal science." Sismondi's Italian histories were read and esteemed by Lord Byron, Percy Bysshe Shelley, and Stendhal. Sismondi influenced many major socialist thinkers including Karl Marx, Rosa Luxemburg, and Robert Owen. Marx thought Sismondi embodied the critique of the "bourgeois science of economics." In his notes, Marx excerpted various aspects of his analysis. Marx was particularly fond of Sismondi's statement that "The Roman proletariat lived almost exclusively at the expense of society. One could almost say that modern society lives at the expense of the proletariat, from the share which it deducts from the reward of his labor." Henryk Grossman argued that Sismondi was a significant methodological and theoretical predecessor of Marx, particularly by identifying the contradiction between use-value and exchange-value as fundamental to capitalism.