"When the eggs of a crocodile are hatching out, the mother watches; the little ones that take to their native element she does not molest, but she eats up all those which run away from the water, but should any escape her and get away on to the land they will change into tigers. Some of these reptiles are said to have tongues, and when possessed of that organ they are very much more vicious and dangerous than the ordinarily formed ones. When a crocodile enters a river it swallows a pebble, so that on opening the stomach of one it is only necessary to count the stones in it to tell how many rivers it has been into during its life. The Malays call these stones kira-kira dia, [495] on this account. The Indians on the banks of the Orinoco, on the other hand, assert that the alligator swallows stones to add weight to its body to aid it in diving and dragging its prey under water. Crocodiles inhabiting a river are said to resent the intrusion of strangers from other waters, and fights often take place in consequence. According to the Malays they are gifted with two pairs of eyes. The upper ones they use when above water, and the under pair when beneath the surface. This latter pair is situated half-way between the muzzle and the angle of the mouth, on the under surface of the lower jaw. These are in reality not eyes, but inward folds of skin connected by a duct with a scent gland, which secretes an unctuous substance of a dark gray colour, with a strong musky odour. Medicinal properties are attributed to the flesh of the males, which are believed to be of very rare occurrence, and to be quite unable to leave the water by reason of their peculiar conformation. The fact is that the sexes are almost undistinguishable, except on dissection, and therefore the natives class all that are caught as females. While on this subject, it may be worth mentioning that at Port Weld there used to be a tame crocodile which would come when called. The Malays fed it regularly, and said it was not vicious, and would not do any harm. It was repeatedly seen by the yearly visitants to Port Weld, or Sapetang, as the place was then called, and was a fine big animal, with a bunch of seaweed growing on its head. Some one had it called, and then fired at the poor thing; whether it was wounded or only frightened is uncertain, but it never came again." [496] The following notes upon the same subject were collected by me in Selangor:-- The female crocodile commonly builds her nest, with or without the aid of the male, among the thorny clumps of lempiei (or dempiei) trees just above high-water mark, using the fallen leaves to form the nest, and breaking up the twigs with her mouth. The season for laying is said, in the north of the Peninsula, to coincide with the time "when the rice-stalks swell with the grain," i.e. the end of the wet season.