Neckam’s account differs a good deal from the story as told by the Arabian historian, Masʿudi, in the tenth century. There we read that, when Alexander was building the city of Alexandria, monsters came from the sea every night and overthrew the walls that had been built during the day. Night watchmen proved of no avail, so Alexander had a box made ten cubits long and five wide, with glass sides fastened into the frame work by means of pitch and resin. He then entered the box with two draughtsmen, who, after it had been let down to the bottom of the sea, made exact drawings of the monsters, who had human bodies but the heads of beasts. From these sketches Alexander had images constructed and placed on pillars, and these magic figures served to keep off the monsters until the city was completed. But the effect apparently began to wear off and talismans had to be added on the pillars to prevent the monsters from coming and devouring the inhabitants, as they had begun to do again.[829] Another Arab, Abu-Shâker, of the thirteenth century, repeats a current tradition that Aristotle gave Alexander a box of wax soldiers which were nailed, with inverted spears and swords and severed bow-strings, face-downwards in the box, which in its turn was fastened by a chain. As long as the box remained in Alexander’s possession and he repeated the formulae which Aristotle taught him whenever he took the box up or put it down, he would triumph over his foes in war.[830] This reminds one of the methods of warfare employed by Alexander’s fabled natural father, Nectanebus. [Sidenote: A magic horn.] While we are speaking of military matters, it may be noted that in a manuscript of the thirteenth century which once belonged to an Albertus Bohemus or Beham, dean of the church at Padua, and seems to have been his note-book, we find between the _Secret of Secrets_ of the Pseudo-Aristotle and a treatise on the significations of the moon in the signs “a delineation of a brazen horn made with marvelous art by which Alexander in time of war summoned his army from a distance of sixty miles.”[831] Such a horn “of Temistius” is mentioned in some versions of the _Secret of Secrets_.[832] [Sidenote: More stories of Alexander and gems.]