“ In 1883-1885 he undertook a fourth journey of exploration in the wild mountain regions between Mongolia and Tibet. On these four expeditions he made collections of plants and animals of inestimable value, including nearly twenty thousand zoological and sixteen thousand botanical specimens. Among other remarkable discoveries were those of the wild camel, ancestor of the domesticated species, and of the early type of horse, now known by his name (Equus prjewalskii) . Prjevalsky's account of this second journey, From Kulja, across the Tian-Shan, to Lop-nor, was translated into English in 1879. ”