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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.