Tiahuanaco is a small town, situated upon a rise, in a wide valley, with a long view to the east. The ruins are close to the town, and from the level low ground towards the lake, no doubt the palace was originally built upon the shore, now out of sight. By a rough calculation, Lake Titicaca contains three thousand square miles. While we look upon the parched hills and table-lands on the one hand, and eternal ice on the other, it would seem this basin of ice-water was uplifted more than twelve thousand feet above the ocean, for the daily use of the sun as he passes. The evaporation is great, from the numerous streams which flow into the lake; and was the wet season withheld awhile, the basin would be emptied; but the precipitation and evaporation are now equipoised. As the lake is at its lowest, the rains will soon commence and fill it up again.

As the sun passes on south, he draws the rain-belt after him. He is now nearly vertical. When he completes his tour to the north of the equator, he returns next year to find Titicaca brimful, which is evaporated before the rains commence again. Were it not for the flooding of the lake every year, we might find the water salt instead of fresh.

We leave Lake Titicaca for the dry table-lands of Bolivia. On the road-side, at the base of the Sorata range, we halted to look at the Indians plough in their potatoes. The women were the planters. They plant the small potatoes of last year whole, instead of cutting the larger ones for seed. We attempted to explain to one of the women why she always raised such small potatoes; but she evidently misunderstood us. Running off to the end of the row, where there was a large earthen jar, she returned with a cup of chicha.

At Tambillo post-house, after passing the night, the postman was disposed to charge us double. His mules, like himself, look very poor. Half a dozen old houses stood out on the plain, with nothing about them to admire but the lofty snow-peaks. I hired mules to take us all the way to La Paz, but at Lapa they gave out. The postillions had them changed in the post-house, and wanted to continue with the fresh mules; but the Lapa postillions objected; and as ours refused to pay them that part of the fare which had been advanced, the subject was debated in the middle of the patio. A very respectable-looking old Indian walked in, and after speaking some time to the parties, our men paid, and we pushed on over the plain, in company with Indians and loaded jackasses on their way to market, and droves of unloaded mules on their return towards the coast, after having brought in loads of foreign manufactures.

Suddenly arriving at the edge of a deep ravine, we saw the tile-roofs of the city of La Paz, near the base of the great snow-capped mountain, Illimani. Descending by a steep, narrow road, and passing the cemetery, the air was found loaded with the perfume of sweet flowers. Springs of fresh water gushed out by the road-side, into which our mules sunk their noses before we could get a drink. As we entered the town, some one called out from a shaded piazza for our passports. We kept on, answering we had none for Bolivia; but on looking back, a man was seen stopping our baggage, which was a pretty effectual way of bringing us to. After showing our Peruvian papers, an Indian was sent with us to the custom-house, and the police officer directed the man to show me the house of the gentleman to whom I had letters of introduction.

The most tiresome and troublesome part of the journey is the day of arrival in a large town, where we generally remain long enough to rest and pick up information. There are no hotels to which a traveller may go and make himself independently comfortable. Walking into a man's private house, bag and baggage, and handing him a letter of introduction, which plainly expresses that the bearer has come to make his house his home, is the custom of the country. We entered the most elegant house I saw in South America.

The gentleman of the house was not at home; he was engaged superintending the Indians at the gold mines and washings of Tipuani, situated north of La Paz, on a tributary of the river Beni, and to the east of the Sorata mountains. His daughter received the letter, smoking a large cigar, and invited us to join. Her husband was prefect of the province of Yungas, where is gathered the best cinchona bark. As it was Saturday, and 4 o'clock, the officers had left the custom-house, and the baggage could not be examined before Monday morning. Notwithstanding the lady of the house sent our letters to the prefect, and asked that we might have our clothing. We were in a house with four young ladies and no gentleman, so there was a poor chance of borrowing.

The party was a good deal sun-burnt, dusted, and harassed over the hot plains since leaving Cuzco, and all well tired out. Richards suffered, though he stood the travel better than was expected. José's beard had grown, and he had pulled an old white hat about so much to get it on the sunny side of his head, that he at once applied for part of his wages to purchase a new one. When we arrive, José always goes at once to pay his respects to the lady of the house, and through him a general sketch of our duties and characters are obtained. He is so polite, and of such an obliging disposition, that he seems to attract attention wherever he goes. He is fond of travelling, and, for so old a person, bears his part well, sleeps sound, and enjoys good health.

La Paz, the commercial metropolis of Bolivia, has a population of 42,849. It is the capital of the department, which has a population of 90,662 creoles, and 295,442 Aymara Indians. The small stream of water flowing through the city at the bottom of the ravine may be stepped across without wetting one's feet. As it dashes down through the Andes to the eastward, other streams join it, and after swelling out and gaining the base of the mountains, it is called the river Beni, which flows, in a northeast direction, through the territory of Bolivia. Some parts of the Beni are navigated by wooden balsas; but there are many falls, and the river-bed is rocky and rough, with a rapid current. The Beni is not navigable for steamboats. It flows through the wild forests, inhabited by uncivilized Indian tribes. On the tributaries of the Beni, gold is found, and the best quality of cinchona bark. By referring to the map, it will be observed that the tributaries of the Madre-de-Dios, in Peru, and those of the Beni, take their rise very near each other, in a line between the gold-washings of Tipuani and Carabaya. The waters of the former flow into the Amazon, while those of the latter go to the Madeira river. There is a ridge of mountains and hills between them.

A knot or hump seems to be raised in this part of the back-bone of South America, from which the water flows in different directions. The loftiest peaks of mountains are near, and the large lakes are found here. We see a cluster of wonders, from the hot springs of Agua Caliente post-house to the frozen peaks of the Sorata; extremes of heat and cold, large mountains, and small streams, dry winds, and lakes of water, in the richest gold region of South America.