On his return to Palermo, he devoted himself specially to the geography of the Oxus region, and the result appeared next year in his introduction and notes to Wood’s _Journey_. Soon after his return to Palermo, he became greatly interested in the plans, about which he was consulted, of an English church, the gift to the English community of two of its oldest members, Messrs Ingham and Whitaker. Yule’s share in the enterprise gradually expanded, until he became a sort of volunteer clerk of the works, to the great benefit of his health, as this occupation during the next three years, whilst adding to his interests, also kept him longer in the open air than would otherwise have been the case. It was a real misfortune to Yule (and one of which he was himself at times conscious) that he had no taste for any out-of-door pursuits, neither for any form of natural science, nor for gardening, nor for any kind of sport nor games. Nor did he willingly ride.[61] He was always restless away from his books. There can be no doubt that want of sufficient air and exercise, reacting on an impaired liver, had much to do with Yule’s unsatisfactory state of health and frequent extreme depression. There was no lack of agreeable and intelligent society at Palermo (society that the present writer recalls with cordial regard), to which every winter brought pleasant temporary additions, both English and foreign, the best of whom generally sought Yule’s acquaintance. Old friends too were not wanting; many found their way to Palermo, and when such came, he was willing to show them hospitality and to take them excursions, and occasionally enjoyed these. But though the beautiful city and surrounding country were full of charm and interest, Yule was too much pre-occupied by his own special engrossing pursuits ever really to get the good of his surroundings, of which indeed he often seemed only half conscious. By this time Yule had obtained, without ever having sought it, a distinct and, in some respects, quite unique position in geographical science. Although his _Essay on the Geography of the Oxus Region_ (1872) received comparatively little public attention at home, it had yet made its mark once for all,[62] and from this time, if not earlier, Yule’s high authority in all questions of Central Asian geography was generally recognised. He had long ere this, almost unconsciously, laid the broad foundations of that “Yule method,” of which Baron von Richthofen has written so eloquently, declaring that not only in his own land, “but also in the literatures of France, Italy, Germany, and other countries, the powerful stimulating influence of the Yule method is visible.”[63] More than one writer has indeed boldly compared Central Asia before Yule to Central Africa before Livingstone!