After tobacco the most important product of the Cumanacoa valley is indigo, whose intense color makes it the equal of Guatemalan indigo. All the indigo factories that we visited are constructed along the same principles. Two vats, where the plants 'rot', are placed together. Each one measures 15 feet square and 2. feet deep. From these upper vats the liquid passes into beaters where the water-mill is placed. The axle-tree of the great wheel crosses the two beaters. It is nailed with ladles, fixed to long handles, for the beating. From another percolating vat the coloured starch passes to the drying-boxes, spread on planks of Brazil-wood on small wheels so that they can be pushed under a roof in case of sudden rain. These sloping and low roofs give the drying-boxes the appearance of hothouses from a distance. In the Cumanacoa valley the fermentation of the plant takes place amazingly quickly; usually it does not take longer than four or five hours. This can be attributed to the humidity and the absence of sun during the plant's development.

But the shores of Lake Valencia are not famed solely for their picturesque beauties: the basin presents several phenomena whose interpretation holds great interest for natural historians and for the inhabitants. What causes the lowering of the lake's water-level? Is it receding faster than before? Will the balance between the flowing in and the draining out be restored, or will the fear that the lake might dry up be proved justified?

To the north of the Cape Verde Islands we found great masses of floating seaweeds They were the tropical sea- grape variety (Fucus natans), which grow on rocks below sea-level from the Equator to the 40th degree of latitude. These seaweeds seem to indicate the presence of currents. These scattered weeds should not be confused with those banks of weeds that Columbus compared to great meadows, which terrified the crew of the Santa Maria on the 42nd degree of latitude.

The perpetual cool that prevails in La Laguna makes the city the favorite home for the inhabitants of the Canaries. The residential capital of Tenerife is magnificently placed in a small plain surrounded by gardens at the foot of a hill crowned with laurel, myrtle and strawberry trees. It would be a mistake to rely on some travelers who believe the town lies by a lake. The rain sometimes forms an enormous sheet of water, and a geologist who sees the past rather than the present state of nature in everything would not doubt that the whole plain was once a great lake, now dried up. La Laguna has fallen from its opulence since the erupting volcano destroyed the port of Garachico and Santa Cruz became the trading center of the island. It has no more than 9, inhabitants, with nearly 400 monks distributed in six convents, though some travelers insist half the population wear cassocks. Numerous windmills surround the city, a sign that wheat is cultivated in this high country. The Guanches called wheat at Tenerife tano, at Lanzarote triffa; barley in Gran Canaria was called aramotanoque, and at Lanzarote tamosen. The flour of roasted barley (gofio) and goat's milk constituted the main food of these people about whose origins so many systematic fables have been written.

On leaving Spain I had promised to join his expedition wherever I could reach it. Bonpland, as active and optimistic as usual, and I immediately decided to split our herbals into three lots to avoid the risk of losing what had taken so much trouble to collect on the banks of the Orinoco, Atabapo and Río Negro. We sent one collection by way of England to Germany, another via Càdiz to France, and the third we left in Havana. We had reason to congratulate ourselves on this prudence. Each collection contained virtually the same species; if the cases were taken by pirates there were instructions to send them to Sir Joseph Banks or to the natural history museum in Paris. Luckily I did not send my manuscripts to Càdiz with our friend and fellow traveler Father Juan Gonzalez, who left Cuba soon after us but whose vessel sank off Africa, with the loss of all life. We lost duplicates of our herbal collection, and all the insects Bonpland had gathered. For over two years we did not receive one letter from Europe; and those we got in the following three years never mentioned earlier letters. You may easily guess how nervous I was about sending a journal with my astronomical observations and barometrical measurements when I had not had the patience to make a copy. After visiting New Granada, Peru and Mexico I happened to be reading a scientific journal in the public library in Philadelphia and saw: 'M. de Humboldt's manuscripts have arrived at his brother's house in Paris via Spain. I could scarcely suppress an exclamation of joy.

When I was in Spanish Río Negro the conflict between the Courts of Lisbon and Madrid - even in peaceful times - had heightened the mistrust of the commanders of petty neighboring forts. A commander with sixteen to eighteen soldiers tired 'the garrison' with his measures for safety, dictated by 'the important state of affairs'. If were attacked he hoped 'to surround the enemy'. A people who have preserved a national hatred through the ages loves any excuse to vent it. We enjoy all that is passionate and dynamic, as much in our feelings as in the rival hatreds built up on age-old prejudices. On the banks of the Río Negro the Indians in the neighboring Portuguese and Spanish villages hate each other. These poor people speak only their Indian languages and have no idea what happens 'on the other bank of the ocean, beyond the great salt pond', but the gowns of the missionaries are of different colors and this enrages them.