The whole coast of Peru abounds in fish of various kinds, among which are great quantities of sea-calves or seals, of several species.  Beyond the river of Tumbez there are no caymans or alligators, which is supposed to be owing to the too great coolness of the sea and rivers, as these animals delight in heat; but it is more probable that their absence from the rivers of Peru is occasioned by their great rapidity, as they usually frequent rivers that are very still.  In the whole extent of the plain there are only five cities inhabited by the Christians[20].  The first of these, Puerto Viejo, about one degree south of the line, has very few inhabitants, as it stands in a poor and unwholesome country, in which the principal production of value is a few emeralds.  Fifty leagues to the southward, and about fifteen leagues from the coast, is the city of San Miguel, named Piuru by the Indians, in a pleasant and fruitful country, but which has no mines of gold or silver.  Most people who have occasion to go there are liable to be afflicted with diseases of the eyes.  Sixty leagues farther along the coast, is the city of Truxillo, two leagues from the sea, in the valley of Chimo, having a dangerous harbour of difficult approach.  This city stands on the banks of a river in a fine plain, which is fertile in wheat and maize, and breeds great abundance of cattle, having plenty of excellent water.  Truxillo is very regularly built, and is inhabited by about three hundred Spanish families.  About eighty leagues from Truxillo to the south, and in the valley of Rimac, stands the city of Los Reys, or Lima, because it was founded at Epiphany, vulgarly called the day of the kings.  This city is about two leagues from the harbour of Callao, an excellent and secure harbour, and is situated on a large river in a fine plain, abounding in grain, and in all kinds of fruit and cattle.  All the streets are perfectly straight, and all of them lead towards the country, which may be seen from all parts of the city.  This is a most agreeable residence, as the air is always temperate, being never either too hot or too cold at any season of the year.  During the four months which constitute the summer in Spain, the air here is somewhat cooler than for the rest of the year; and every day from sun-rise to noon there falls a light dew, somewhat like the mists at Valladolid in Old Spain.  Far from being injurious to health, this slight moisture is reckoned an infallible cure for headaches.  This part of the country produces the same kinds of fruit as are found in Spain, particularly oranges, citrons, and lemons of all kinds, both sweet and sour, with figs and pomegranates.  It might assuredly have produced grapes in great abundance, if the discords which have prevailed in this country had allowed the colonists to plant and cultivate the vine; as it already has several thriving vine plants which have grown from the pips of dried raisins.  The neighbouring country produces all kinds of pot