All These Trees (With The Exception Of Our New Genus Retiniphyllum) Were More Than One Hundred Or One Hundred And Ten Feet High.

As their trunks throw out branches only toward the summit, we had some trouble in procuring both leaves and flowers.

The latter were frequently strewed upon the ground at the foot of the trees; but, the plants of different families being grouped together in these forests, and every tree being covered with lianas, we could not, with any degree of confidence, rely on the authority of the natives, when they assured us that a flower belonged to such or such a tree. Amid these riches of nature heborizations caused us more chagrin than satisfaction. What we could gather appeared to us of little interest, compared to what we could not reach. It rained unceasingly during several months, and M. Bonpland lost the greater part of the specimens which he had been compelled to dry by artificial heat. Our Indians distinguished the leaves better than the corollae or the fruit. Occupied in seeking timber for canoes, they are inattentive to flowers. "All those great trees bear neither flowers nor fruits," they repeated unceasingly. Like the botanists of antiquity, they denied what they had not taken the trouble to observe. They were tired with our questions, and exhausted our patience in return.

We have already mentioned that the same chemical properties being sometimes found in the same organs of different families of plants, these families supply each other's places in various climates. Several species of palms* furnish the inhabitants of equinoctial America and Africa with the oil which we derive from the olive. (* In Africa, the elais or maba; in America the cocoa-tree. In the cocoa-tree it is the perisperm; and in the elais (as in the olive, and the oleineae in general) it is the sarcocarp, or the pulp of the pericarp, that yields oil. This difference, observed in the same family, appears to me very remarkable, though it is in no way contradictory to the results obtained by De Candolle in his ingenious researches on the chemical properties of plants. If our Alfonsia oleifera belong to the genus Elais (as Brown, with great reason believes), it follows, that in the same genus the oil is found in the sarcocarp and in the perisperm.) What the coniferae are to the temperate zone, the terebinthaceae and the guttiferae are to the torrid. In the forests of those burning climates, (where there is neither pine, thuya, taxodium, nor even a podocarpus,) resins, balsams, and aromatic gums, are furnished by the maronobea, the icica, and the amyris. The collecting of these gummy and resinous substances is a trade in the village of Javita. The most celebrated resin bears the name of mani; and of this we saw masses of several hundred-weight, resembling colophony and mastic. The tree called mani by the Paraginis, which M. Bonpland believes to be the Moronobaea coccinea, furnishes but a small quantity of the substance employed in the trade with Angostura. The greatest part comes from the mararo or caragna, which is an amyris. It is remarkable enough, that the name mani, which Aublet heard among the Galibis* of Cayenne, was again heard by us at Javita, three hundred leagues distant from French Guiana. (* The Galibis or Caribis (the r has been changed into l, as often happens) are of the great stock of the Carib nations. The products useful in commerce and in domestic life have received the same denomination in every part of America which this warlike and commercial people have overrun.) The moronobaea or symphonia of Javita yields a yellow resin; the caragna, a resin strongly odoriferous, and white as snow; the latter becomes yellow where it is adherent to the internal part of old bark.

We went every day to see how our canoe advanced on the portages. Twenty-three Indians were employed in dragging it by land, placing branches of trees to serve as rollers. In this manner a small boat proceeds in a day or a day and a half, from the waters of the Tuamini to those of the Cano Pimichin, which flow into the Rio Negro. Our canoe being very large, and having to pass the cataracts a second time, it was necessary to avoid with particular care any friction on the bottom; consequently the passage occupied more than four days. It is only since 1795 that a road has been traced through the forest. By substituting a canal for this portage, as I proposed to the ministry of king Charles IV, the communication between the Rio Negro and Angostura, between the Spanish Orinoco and the Portuguese possessions on the Amazon, would be singularly facilitated.

In this forest we at length obtained precise information respecting the pretended fossil caoutchouc, called dapicho by the Indians. The old chief Javita led us to the brink of a rivulet which runs into the Tuamini; and showed us that, after digging two or three feet deep, in a marshy soil, this substance was found between the roots of two trees known by the name of the jacio and the curvana. The first is the hevea of Aublet, or siphonia of the modern botanists, known to furnish the caoutchouc of commerce in Cayenne and Grand Para; the second has pinnate leaves, and its juice is milky, but very thin, and almost destitute of viscosity. The dapicho appears to be the result of an extravasation of the sap from the roots. This extravasation takes place more especially when the trees have attained a great age, and the interior of the trunk begins to decay. The bark and alburnum crack; and thus is effected naturally, what the art of man performs for the purpose of collecting the milky juices of the hevea, the castilloa, and the caoutchouc fig-tree. Aublet relates, that the Galibis and the Garipons of Cayenne begin by making a deep incision at the foot of the trunk, so as to penetrate into the wood; soon after they join with this horizontal notch others both perpendicular and oblique, reaching from the top of the trunk nearly to the roots.

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