There is exciting chemical and physiological work to be done in Europe with the effects of New World poisons once we are sure that different poisons from different areas are properly distinguished. As far as our botanical knowledge about these poisonous plants is concerned we could sort out the differences only very slowly. Most Indians who make poison arrows completely ignore the nature of poisonous substances used by other tribes. A mystery surrounds the history of toxics and antidotes. Among wild Indians the preparation is the monopoly of piaches, who are priests, tricksters and doctors all at once; it is only with Indians from the missions that you can learn anything certain about such problematic matters. Centuries passed before any Europeans learned, thanks to Mutis's researches, that the bejuco del guaco is the most powerful antidote to snake bites, and which we were the first to describe botanically.

It was already dark when we crossed the Orinoco bed for the last time. We meant to spend the night near the small San Rafael fort and begin the journey across the Venezuelan steppes at dawn. Nearly six weeks had passed since our arrival at Angostura, we dearly wanted to reach the Cumanà or Nueva Barcelona coasts to find a boat to take us to Cuba and then on to Mexico. After several months on mosquito-infested rivers in small canoes, a long sea journey excited our imaginations.

Until the middle of the last century the mountains surrounding the Aragua valley were covered in forests. Huge trees of the mimosa, ceiba and fig families shaded the lake shore and kept it cool. The sparsely populated plain was invaded by shrubs, fallen tree trunks and parasitical plants, and was covered in thick grass so that heat was not lost as easily as from cultivated ground, which is not sheltered from the sun's rays. When the trees are felled, and sugar cane, indigo and cotton are planted, springs and natural supplies to the lake dry up. It is hard to form a fair idea of the enormous amount of evaporation taking place in the torrid zone, especially in a valley surrounded by steep mountains where maritime breezes blow, and whose ground is completely flat as if leveled by water. The heat prevailing on the lake shore is comparable to that in Naples and Sicily.

This tree, which grows only in cultivated areas in the Canaries, Madeira and Porto Santo, presents a curious phenomenon in plant migration. In Africa it has never been found in a wild state, and its country of origin is East India. How has this tree become acclimatized in Tenerife? Did the Guanches have contact with nations originally from Asia?

The bones are prepared in three different ways; they are whitened, or colored red with annatto, a dye from Bixa orellana, or varnished with a scented resin and wrapped like mummies in banana leaves. Indians insisted that as soon as somebody died the corpse was left for months in damp earth so that the flesh rotted away; then it was dug up and the remains of the flesh scraped off with a sharp stone. Some tribes in Guiana still practice this method. Next to the baskets or mapires we also found half-baked clay urns with the remains of whole families. The largest urns are almost 3 feet high and 5. feet wide. They are greenish, and of a pleasing oval shape. Some have crocodiles and snakes drawn on them. The top edges are decorated with meanders and labyrinths. These are very similar to the decorations covering the walls of the Mexican palace at Mitla; they are found everywhere, even among the Greeks and Romans, as on the shields of the Tahitians and other Pacific Islanders.