Agricola describes the asp to be four feet long, and of the thickness of a spear. The cerastes, he says, in other respects resembles a viper, except that it has two or four substances on its head like horns. Madden, a late traveller in the East, gives a different account of the horned serpent (coluber cerastes); he says that of two which he purchased from the Psylli one was a foot long, and the other a foot and a half. A lancet smeared with the venom of one of them killed a dog in three hours. The French naturalists who attended the expedition to Egypt found a viper, called _hage_ by the inhabitants, which they held to be identical with the asp of the ancients. We need have no hesitation then in deciding that the coluber Ægyptiacus is the celebrated asp of antiquity. That the cerastes was a variety of the asp seems highly probable from the description which Nicander gives of both. (Theriac 177 and 259.) See also Wilkinson’s ‘Thebes,’ p. 378. In fine, the asp and cerastes were merely varieties of the common viper of Egypt. SECT. XIX.—ON THE BASILISK. This reptile seldom comes under the sight of men; but Erasistratus says, when the basilisk bites one the wound becomes of a faint golden colour, and he also says that three drachms of castor taken in a draught proves a remedy in such cases, and in like manner the juice of poppy; but we have had no trial of these things. * * * * * COMMENTARY. The basilisk, according to Nicander, has a sharp body about three palms in length, of a bright yellow colour, and is called the king of reptiles, because all the others flee from his hiss. Pliny, Solinus, and most of the ancient authorities seem to copy Nicander’s description of the basilisk. The symptoms produced by his sting are said to be inflammation of the whole body, lividity and putrefaction of the flesh. (Theriac. l. c.) See also Galen (Ther. ad Pison.) Avicenna states that the basilisk stupefies birds and other animals which approach him. He relates the case of a soldier who transfixed a basilisk with his spear, and the poison proved fatal both to him and his horse, whose lip was accidentally wounded with the spear. Lucan relates the case of a soldier in the army of Cato, who having wounded a basilisk with a spear, and having felt his hand affected with the poison, saved his life by immediately cutting it off with his sword. (Phars. ix, 830.) Similar histories are given by Pliny, Dioscorides, Actuarius, and Isidorus. Solinus affirms that it proves fatal to all beasts, birds, and vegetables. For an explanation of the passages of scripture wherein mention is made of the basilisk, see Bochart (Hier. ii, 339.)