There are other insect parasites, for the increase and protection of which a hairy coating is even more favourable than it is for the ticks. The Pediculi are specially adapted to live amongst hair, their limbs being constructed for clinging to it. They deposit their nits or eggs amongst it, fastening them securely to the bases of the hairs. Although the pediculi are almost unknown to the middle and upper classes of civilised communities, in consequence of the cleanliness of their persons, clothing, and houses, they abound amongst savage and half-civilised people. A slight immunity from the attacks of acari and pediculi might in a tropical country more than compensate an animal for the loss of its hairy coat, especially in the case of the domesticated dog, which finds shelter with its master, has not to seek for its food at night, and is protected from the attacks of stronger animals. In the huts of savages dogs are greatly exposed to the attacks of parasitical insects, for vermin generally abound in such localities. Man is the only species amongst the higher primates that lives for months and years--often indeed from generation to generation--on the same spot. Monkeys change their sleeping places almost daily. The ourang-outang, that makes a nest of the boughs of trees, is said to construct a fresh one every night. The dwelling places of savages, often made of, or lined with, the skins of animals, with the dusty earth for a floor, harbour all kinds of insect vermin, and produce and perpetuate skin disease, due to the attacks of minute sarcopti. If the dog by losing its hair should obtain any protection from these and other insect pests, instead of wondering that a hairless breed of dogs has been produced in a tropical country, I am more surprised that haired ones should abound. That they do so must, I think, be owing to man having preferred the haired breeds for their superior beauty and greater variety, and encouraged their multiplication. CHAPTER 12. Olama. The "Sanate." Muy-muy. Idleness of the people. Mountain road. The "Bull Rock." The bull's-horn thorn. Ants kept as standing armies by some plants. Use of honey-secreting glands. Plant-lice, scale-insects, and leaf-hoppers furnish ants with honey, and in return are protected by the latter. Contest between wasps and ants. Waxy secretions of the homopterous hemiptera.