sentences:  In the 1870s, as his financial position improved, Uspensky traveled widely, becoming acquainted with a number of revolutionary populists, such as Pyotr Lavrov (the "Vperyod" magazine's editor in London, who several months later published his essay "One Won't Hide a Needle in a Sack") and Sergey Stepnyak.In 1875 Uspensky went to Paris again where he met Ivan Turgenev.The latter recited one of his stories, "Petitioners" (Ходоки), at Pauline Viardot's literary morning, and had great success.