The sword-fish (_Xiphias_), although a vegetable feeder, is mentioned by Pliny (xxxii. 6) as able to sink a ship. It is recorded to have killed a man when bathing in the Severn near Worcester. It attacks the whale, and it has been known to transfix a vessel’s side with its terrible weapon. The narwhal or sea-unicorn (_Monodon monoceros_) carries a formidable tusk, a Sword-blade of the same kind similarly used.[35] Here may be offered a single proof how Man, living among, and dependent for food upon, the lower animals, borrowed from their habits and experience his earliest practice of offence and defence. The illustration represents a ‘Singhauta,’[36] ‘Mádu’ or ‘Máru’ (double dagger), made from the horns of the common Indian antelope, connected by crossbars. In its rude state, and also tipped with metal, it is still used as a weapon by the wild Bhíls, and as a crutch and dagger by the Jogis (Hindús) and Fakirs (Hindís or Moslems), both orders of religious mendicants who are professionally forbidden to carry secular arms. It also served for defence, like the parrying-stick of Africa and Australia, till it was fitted with a hand-guard, and the latter presently expanded into a circular targe of metal. This ancient instrument, with its graceful curves, shows four distinct stages of development: first, the natural, and, secondly, the early artificial, with metal caps to make it a better thrusting weapon. The third process was to forge the whole of metal; and the fourth and final provided it with a straight, broad blade, springing at right angles from the central grip. This was the ‘Adaga’[37] of mediæval writers. [Illustration: FIG. 8.—THE ADAGA.]