The site of Lima gradually inclines to the westward, the great square, plasa mayor, being 480 feet above the level of the sea. Thus all the streets in this direction, with many of those intersecting them at right angles, have small streams of water running along them, which contribute very much to the cleanliness and salubrity of the city and its inhabitants. The water which runs through the streets, as well as that which feeds the fountains and the canals for the irrigation of gardens, orchards and plantations, which fill the whole valley, is drawn from the river Rimac. This river has its origin in the province of Huarochiri, and receives in its course several small streams, which descend the mountains, and are produced by the melting of the snow on the tops of the Andes, as well as by the rains which fall in the interior, at which time the river swells very much, and covers the whole of its bed, which at other times is in many places almost dry. The water in Lima is said to be crude, holding in solution a considerable quantity of selenite, besides being impregnated with abundance of fixed air; hence, indigestions and other affections of the stomach are attributed to it; but Dr. Unanue very justly asks, "may not these diseases be derived from Cupid and Ceres?" The water is certainly far from being pure; for the artaxea, which supplies the city fountains, and the pugios, which supply the suburbs, called San Lazaro, are stagnant pools; both are often full of aquatic plants, which decay and rot in them; they moreover contain water that has been employed in the irrigation of the plantations and farms at the back of the city, and not unfrequently animals have been drowned in them.
The climate of Lima is extremely agreeable; the heat which would naturally be expected in so low a latitude is seldom felt, and those who have been accustomed to the scorching sun and suffocating heat of Bahia, on the opposite side of the Continent, or to those of Carthagena, in the same latitude, are astonished at the mild and almost equable climate of Lima. The following thermometrical observations, made in the years 1805 and 1810, will evince the truth of what has been asserted:—
THERMOMETRICAL OBSERVATIONS,
MADE AT NOON IN THE SHADE OF AN OPEN ROOM AT LIMA.
1805 | 1810 | ||||||
___ | /\ | ___ | ___ | /\ | ___ | ||
/ | \ | / | \ | ||||
Max. | Min. | Max. | Min. | ||||
January | 77 | 74¾ | 76 | 73¾ | |||
February | 79½ | 76 | 77 | 74¾ | |||
March | 78½ | 74¾ | 77 | 74¾ | |||
April | 74¾ | 72 | 74¾ | 71¼ | |||
May | 73¾ | 67 | 71¼ | 67 | |||
June | 65¾ | 65 | 66 | 64 | |||
July | 65 | 63 | 64¾ | 61 | |||
August | 63½ | 62¾ | 63¾ | 61 | |||
September | 65 | 63½ | 64¾ | 64 | |||
October | 65¾ | 63½ | 65¾ | 63½ | |||
November | 69½ | 65¾ | 69½ | 65½ | |||
December | 73¾ | 69½ | 71½ | 70 | |||
—— | —— | —— | —— | ||||
Mean height du-} |