Purchased a _Thob_[32], a species of large lizard. It is common in The Sahara. The Touaricks eat them, and say they are _medicine_ for a pain or weakness in the back. This may have been surmised from the ideal resemblance between the strength of their backs, which is scaly and bony, and strongly bound together, and the strength it is likely to communicate unto persons having a weak or crippled spine. They are pretty good eating, and taste something like the kid of the goat; the tail is esteemed the greatest delicacy. I tasted of this which I bought, and liked it. There is no lizard of this species in Soudan. A Touarick told me that, having found one in The Desert, he carried it to Soudan, where a Negro prince fell in love with it, and gave him for it the present of a young female slave. The Arabs tame the Thob, and he grows very fond. Some of them are very large. This I purchased is only twenty inches in length, and about ten round the thickest part of the body. The head is large and tortoise-shaped, with a small mouth. It is covered with scales, or "scaly mail," and its tail is about four inches long, composed of a series of broad thick and sharp bones. It has four feet, or rather _hands_, for, as the Arabs say, "It has hands like _Ben-Adam_ (mankind)." All the body, back and flanks, are covered by shining scales, of the colour of a darked-spotted grey, with spots white and light under the belly. It runs very awkwardly on account of its bulky tail, and to look at is a miniature aligator or crocodile. It is almost harmless, fighting a little now and then; its appearance, however, is rather forbidding. It hides in the dry sandy holes of The Sahara. A drop of water, say the Arabs, would hurt it. The traditions of the Mohammedans mention that Mahomet did not himself eat the Thob, at the same time he did not prohibit it to his followers. The Saharan merchants, in traversing The Desert, frequently make a good meal of the Thob. Whilst talking of the Thob, the people said the flesh of parrots was _poison_ for Ben-Adam. _25th._--Another of my patients dead, of a raging fever caught, it is said, "by sleeping on the top of the house in the open air." The moon struck him, they say. According to the Psalms, "The sun shall not smite thee by day, nor _the moon by night_."