Tue prevailing winds on this coast from the mouth of the Orange River to Walfish Bay are as follows : - First, in the summer months, namely from November to April, from early morning to midday North to North-west, from midday light South-west, increasing in force till from 7 p.m. to midnight, then dying away gradually and coming round to North before day-break. North to North-west wind brings the fog-bank on shore and sometimes carries it far inland, South to South-east carries it out to sea. Secondly, winter months, May to October, mornings calm with light North-west to North, fog on land, mid-day to midnight light Southwest dying away to calm. Occasional strong northerly wind for from three to four days in succession and once at least in each month for a period of from two to eight days, hot and very dry East wind frequently blowing a full gale. This wind generally comes on about 2 a.m., increasing in force till 10 to 11 a.m., dying away to calm in the -afternoon ; it carries clouds of fine dust, consisting, for the most part, of tiny grains of quartz and flakes of mica.