Therefore, though in the track of my voyage to Tor, I am seen running from the west side of Jibbel Zeit a W. N. W. course (for I had no place for a compass) into the harbour of Tor, I do not mean to do so bad a service to humanity as to persuade large ships to follow my track. There are two ways of instructing men usefully, in things absolutely unknown to them. The first is, to teach them what they can do safely. The next is, to teach them what they cannot do at all, or, warranted by a pressing occasion, attempt with more or less danger, which should be explained and placed before their eyes, for without this last no man knows the extent of his own powers. With this view, I will venture, without fear of contradiction, to say, that my course from Cosseir, or even from Jibbel Siberget, to Tor, is impossible to a great ship. My voyage, painful, full of care, and dangerous as it was, is not to be accounted a surety for the lives of thousands. It may be regarded as a foundation for surveys hereafter to be made by persons more capable, and better protected; and in this case will, I hope, be found a valuable fragment, because, whatever have been my conscientious fears of running servants, who work for pay, into danger of losing their lives by peril of the sea, yet I can safely say, that never did the face of man, or fear of danger to myself, deter me from verifying with my eyes, what my own hands have put upon paper. In the days of the Ptolemies, and, as I shall shew, long before, the west coast of the Red Sea, where the deepest water, and most dangerous rocks are, was the track which the Indian and African ships chose, when loaded with the richest merchandise that ever vessels since carried. The Ptolemies built a number of large cities on this coast; nor do we hear that ships were obliged to abandon that track, from the disasters that befel them in the navigation. On the contrary, they avoided the coast of Arabia; and one reason, among others, is plain why they should;--they were loaded with the most valuable commodities, gold, ivory, gums, and precious stones; room for stowage on board therefore was very valuable.