Vilfredo PARETO (1848–1923), Italian sociologist and economist. L.A.S., April 5, 1904, to a friend; 2¼ pages, in-8. He sends him “a letter of introduction to Mr. Turati, the leader of the Italian moderate socialists; and a letter of introduction to Mr. Antonio Labriola, the leader of the Italian intransigent socialists. Through them, you will meet all the other Italian socialists with whom you wish to be put in touch.” He asks for the title and the publisher’s name of Ostrogorski’s book so he can order it from his bookseller. “I have finished the manuscript of my Italian book [Manuale di economia politica, 1906]; that’s a relief. Now it’s being printed”…