The conditions in which I travelled, though full of unexpected and picturesque opportunities, were not suited to leisurely study of the places visited. The time was limited by the approach of the rainy season, which puts an end to motoring over the treacherous trails of the Spanish zone. In 1918, owing to the watchfulness of German submarines in the Straits and along the northwest coast of Africa, the trip by sea from Marseilles to Casablanca, ordinarily so easy, was not to be made without much discomfort and loss of time. Once on board the steamer, passengers were often kept in port (without leave to land) for six or eight days; therefore for any one bound by a time-limit, as most war-workers were, it was necessary to travel across country, and to be back at Tangier before the November rains.