The deposits were worked from antiquity, but with the rise of monasticism the Wady took a new importance, owing to its discomfort. As early as A.D 150 St. Fronto retreated here from Alexandria. St. Ammon followed in 270; St. Macarius or Mercury a hundred years later. The more moderate ascetics extracted soda with the assistance of laymen; the extremists sought a waterless stretch called Scetis—probably the southern portion of the valley where the monastery to St. Macarius still stands. There were soon 5,000 monks. It is natural that so remote a community should lose touch with the theological niceties of the capital, and in 399 the Patriarch Theophilus was obliged to rebuke the monks for minimising the divine element in the Second Person. Their reply was startling. They crossed the desert, stormed Alexandria, and made the Patriarch apologise. A few years later he led an army into the Wady to punish them, but by now, oddly enough, they had veered to the opposite error; they minimised the human element. The truth is they represented native Egypt, the Patriarch the Hellenising coast. (_see_ p. 51). The quarrel was racial rather than theological, and when in the 6th century it came to a head, the Wady became the natural stronghold of the national or Monophysite party who, under the name of Copts, worship there to this day. With the 19th century came a new colony—the industrial. It is the factory chimney of the Salt and Soda Company that now dominates the scene. The lakes are dredged for their deposits. The chief product is caustic soda which is poured red hot into metal drums, and exported all over the east. Ordinary soda (natron) is also produced. The factory is interesting. It, and the surrounding settlement, are due in their present form to Mr. A. H. Hooker, after whom the settlement is named. More than eighty different species of birds have been identified in the marshes surrounding Bir Hooker. * * * * * _The Mineral Lakes._ These lie between the factory and the monasteries. Some of them are squalid, others are indescribably beautiful, especially in summer. The deposits form at the bottom. As they reach the top, the lake seems to be covered with white and crimson ice, in the midst of which are pools of blue and green water, and trickling streams of claret, and tracts that blush like a rose. When the scene is in mirage, its strangeness passes belief. A bird looks as big as a man, and the lump of salt it perches on shows like a boat of snow. The finest of these lakes is just to the left of Bir Hooker. [Illustration: THE NATRUN MONASTERIES PLAN I. CHURCH OF ST. PSCHOI] [Illustration: THE NATRUN MONASTERIES—PLAN II Convent of the Syrians—Church of the Virgin.] * * * * * _The Monasteries._ Four of these survive, and there are the ruins of many others. They are all of the same type, and to avoid repetitions it may be thus summarised: