These remarkable climatal conditions have been mainly attributed to the influence of the north-east trade wind, which sets along the coast, and prevails, especially in summer, throughout a great part of the year; the average of north and north-east winds being about 271 days out of 365. West and south-west winds blow chiefly in winter on about fifty-seven days in each year, and variable winds from the remaining four points prevail on an average of thirty-seven days. The north-east breeze, increasing in force as the sun approaches the meridian, maintains the exceptionally cool summer temperature already indicated as characteristic of the Mogador climate—a privilege which is not shared by Saffi or Mazagan, where the summer heat is sometimes excessive. It must be noted that although the summer temperature of the interior of Marocco is much higher than that of Mogador, it yet falls far short of what is found in places lying in the same latitude in North Africa or Asia. This is evidently owing to the influence of the Great Atlas chain, with its branches that diverge northward towards the Mediterranean, which screen the entire region from the burning winds of the desert, and send down streams that cover the land with vegetation. When one comes to consider how it happens that a place possessing such extraordinary natural advantages has not become frequented by the class of invalids to whom climate offers the only chance of recovering health, or prolonging life, the obvious answer is, that invalids cannot live on air alone, and that few persons in that condition have the courage to select a place where they may reasonably expect much difficulty in procuring the comforts and even the necessaries of life, competent medical advice, and some reasonable opportunities for occupation or amusement. The difficulties under the first two heads are perhaps not very serious. Lodging and food may apparently be procured on reasonable terms, and for many years past there has always been a competent French physician residing here. The resources of the place in point of society are of course limited, and must vary with the arrival and departure of the few European residents; but any one fortunate enough to be interested in any branch of natural history would find constant occupation of an agreeable kind in a place where there are not half a dozen days in the year that may not be agreeably passed out of doors.[4] A special subject, to be earnestly recommended to any competent inquirer, whether invalid or not, who may pass six months at Mogador, is the language and ethnology of the Shelluh branch of the Bereber race. Many of these mountain people come to seek a living at Mogador, and from our experience it would not be difficult to find one who would become a useful servant.