It Grows Spontaneously On The Banks Of The Cassiquiare.) We Saw Wild Indigo Around The Missions Of San Miguel De Davipe, San Carlos, And Mandavaca.

No doubt can exist that several nations of America, particularly the Mexicans, long before the conquest, employed real indigo in their hieroglyphic paintings; and that small cakes of this substance were sold at the great market of Tenochtitlan.

But a colouring matter, chemically identical, may be extracted from plants belonging to neighbouring genera; and I should not at present venture to affirm that the native indigoferae of America do not furnish some generic difference from the Indigofera anil, and the Indigofera argentea of the Old World. In the coffee-trees of both hemispheres this difference has been observed.

Here, as at the Rio Negro, the humidity of the air, and the consequent abundance of insects, are obstacles almost invincible to new cultivation. Everywhere you meet with those large ants that march in close bands, and direct their attacks the more readily on cultivated plants, because they are herbaceous and succulent, whilst the forests of these countries afford only plants with woody stalks. If a missionary wishes to cultivate salad, or any culinary plant of Europe, he is compelled as it were to suspend his garden in the air. He fills an old boat with good mould, and, having sown the seed, suspends it four feet above the ground with cords of the chiquichiqui palm-tree; but most frequently places it on a slight scaffolding. This protects the young plants from weeds, worms, and those ants which pursue their migration in a right line, and, not knowing what vegetates above them, seldom turn from their course to climb up stakes that are stripped of their bark.

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