Boundaries of the Peruvian Republic.—General appearance and climate of the coast.—Seasons divided into Wet and Dry.—Vegetation.—Lunar influence.—Enervating effects of the climate of Lima.
Modern Peru is bounded on the north by the Republic of the Equator; on the south by the Republic of Bolivia; on the east by the Portuguese territories, or Brazil; and on the west by the Pacific Ocean. The coast of the Republic of Peru extends along the shores of the Pacific from the river Loa, which is the southern boundary that divides it from Bolivia, to the river Tumbez, which divides it on the north from Guayaquil, or the Republic of the Equator. All this extent of coast, from 3° 30´ to 21° 30´ south latitude, is naturally a desert, intersected by several rivers, of greater or less magnitude, that descend along narrow mountain-glens of the Andes to the Pacific Ocean.
Many of these rivers are dried up for several months in the year; while others, of larger size, carry a perennial stream, swelling during the rainy season in the inland country, and are never seen to shrink so much in time of drought in the elevated regions from whence they spring, as not to supply the means of irrigating and beautifying the maritime vales through which they flow as they approach the ocean.
It is remarkable that, while along the coast of Peru the eye wearies in looking at sandy plains and hills, we no sooner pass the river Tumbez than the face of nature changes: in the former range all looks arid and scorched; in the latter country all is verdant and sappy. The coast of the Equatorial Republic presents to the eye well-wooded plains; while on the coast and in the valleys of the western side of the Peruvian territory, trees, when not reared by man, are only to be met growing in favoured places in the vicinity of springs and rivers. Piura, the most northern province of Peru along the shores of the Pacific, is celebrated for its remarkably dry atmosphere; but in a rainy year, which seldom happens in this province, the pastures that suddenly spring up are surpassingly luxuriant,—the very sand-fields, “arenales,” after one or two days’ rain, unfold an exuberance of life and vegetation.
The temperature of the low valleys on the coast of Peru may be said in general not to exceed 82° of Fahrenheit in summer, nor to descend much under 60° in winter.[1] Where, however, high hills closely overhang the sandy plains or dry “pampas,” it is difficult to say to what degree the thermometer may fall during night, when the rush of cold air from the upper regions is in proportion to the degree of radiation from the plains, and the force with which the sun’s rays during the day had struck on the scorched ground. So intensely on such occasions does the traveller feel the transition, that, when benighted on desert places, he is sometimes compelled by the keenness of the cold to dismount, and bury himself up to the neck in the warm sand, until a returning sun again befriend him on the morrow, and encourage him to pursue his trackless way.