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Thanks to his mother, he was not only fluent in German and the international language of the nobility - French - but he knew the language and culture of the Russians and the English equally well. He wrote of himself: "I am Russian, although my Russian blood is mixed with a significant portion of English. He often visited England, met Darwin personally, together with him promoted the establishment in Great Britain of plant physiology, previously not studied there, was proud that, thanks to their cooperation, Darwin's last work was devoted to chlorophyll.