IV. The first idea of a trenchant or cutting instrument would be suggested by various reeds and grasses; their silicious leaves at certain angles cleave to the bone, as experience has taught most men who have passed through a jungle of wild sugar-cane. When full-grown the plants stand higher than a man’s head, and the flint-edged leaves disposed in all directions suggest a labyrinth of sword-blades. Thus the Mawingo-wingo (_Pennisetum Benthami_), like the horse-tail or ‘shave-grass’ of Spain, was used as knives by the executioners of Kings Sunna and Mtesa of Uganda, when cutting the human victims to pieces.[38] Of the same kind are the ‘sword-grass’ and the ‘bamboo-grass.’ Many races, especially the Andamanese and the Polynesian Islanders, make useful blades of the split and sharpened bamboo: they are fashioned from the green plant, and are dried and charred to sharpen the edge. Turning to the animal world, the cassowary tears with a forward cut, and the wounded coot scratches like a cat. The ‘old man kangaroo,’ with the long nail of the powerful hind leg, has opened the stomach of many a staunch hound. The wild boar attacks with a thrust, followed by a rip, cutting scientifically from below upwards. This, as will appear, is precisely the plan adopted by certain ancient forms of sabre, Greek and barbarian, the cutting edges being inside, not outside, the curve. I may add that the old attack is one of our latest improvements in broadsword exercise.[39] The offensive weapon of the sting-ray, and of various insects, as well as the teeth of all animals, man included, furnish models for serrated or saw-edged instruments. Hence Colonel A. Lane Fox observes:[40] ‘It is not surprising that the first efforts of mankind in the construction of trenchant instruments should so universally consist of teeth, or flint-flakes, arranged along the edge of staves.’ But evidently the knife preceded the saw, which is nothing but a knife-blade jagged. Other familiar instances would be the multibarb stings of insects, especially that of the common bee. Again, we have the mantis, an orthopter of the Temperates and the Tropics, whose fights, enjoyed by the Chinese, are compared with the duels of sabrers. For the rasping blow and parry they use the forearm, which carries rows of strong sharp spines; and a happy stroke beheads or bisects the antagonist. To this category belongs the armature of the saw-fish (_Pristis_), a shark widely distributed and haunting the arctic, temperate, and tropical seas. Its mode of offence is to spring high from the water and to fall upon the foe, not with the point, but with either edge of its formidable arm: the row of strong and trenchant barbs, set like teeth, cuts deeply into the whale’s flesh. Hence, in New Guinea, the serrated blade becomes a favourite Sword, the base of the snout being cut and rounded so as to form a handle. [Illustration: FIG. 9.—SERRATED OR MULTIBARBED WEAPONS. 1. Sting of the common Bee; 2. Sting of Ray.]