 He also studied the Hindi and Pashto languages.In 1907, during a vacation, Andreev again arrived in Central Asia, where he walked on foot with Polovtsov from Kashgar, through the Himalayas, along the Karakorum pass to Western Tibet, and, from there, passing Yarkand, Tashkurgan, Vakhan, Shugnan and East Pamir in the Ferghana Valley.In 1911, he was elected a corresponding member fo the Geographical Society of Bengal.