With his small hatchet, or tomahawk, the Indian cuts a gash in the bark, and inserts into it a little wedge of wood to keep the sides apart. Just under the gash, he fixes a small cup-shaped vessel of clay, the clay being still in a plastic state, so that it may be attached closely to the bark. Into this vessel the milk-like sap of the seringa soon commences to run, and keeps on until it has yielded about the fifth of a pint. This, however, is not the whole yield of a tree, but only of a single wound; and it is usual to open a great many gashes, or “taps,” upon the same trunk, each being furnished with its own cup or receiver. In from four to six hours the sap ceases to run.
The cups are then detached from the tree, and the contents of all, poured into a large earthen vessel, are carried to the place where the process of making the caoutchouc is to take place,—usually some dry open spot in the middle of the forest, where a temporary camp has been formed for the purpose.
When the dwelling of the Indian is at a distance from where the india-rubber tree grows,—as is the case with those of Lake Maracaibo,—it will not do to transport the sap thither. There must be no delay after the cups are filled, and the process of manufacture must proceed at once, or as soon as the milky juice begins to coagulate,—which it does almost on the instant.
Previous to reaching his camp, the “seringero” has provided a large quantity of palm-nuts, with which he intends to make a fire for smoking the caoutchouc. These nuts are the fruit of several kinds of palms, but the best are those afforded by two magnificent species,—the “Inaja” (Maximiliana regia), and the “Urucuri” (Attalea excelsa).
A fire is kindled of these nuts; and an earthen pot, with a hole in the bottom, is placed mouth downward over the pile. Through the aperture now rises a strong pungent smoke.
If it is a shoe that is intended to be made, a clay last is already prepared, with a stick standing out of the top of it, to serve as a handle, while the operation is going on. Taking the stick in his hand, the seringero dips the last lightly into the milk, or with a cup pours the fluid gently over it, so as to give a regular coating to the whole surface; and then, holding it over the smoke, he keeps turning it, jack-fashion, till the fluid has become dry and adhesive. Another dip is then given, and the smoking done as before; and this goes on, till forty or fifty different coats have brought the sides and soles of the shoe to a proper thickness. The soles, requiring greater weight, are, of course, oftener dipped than the “upper leather.”
The whole process of making the shoe does not occupy half an hour; but it has afterwards to receive some farther attention in the way of ornament; the lines and figures are yet to be executed, and this is done about two days after the smoking process. They are simply traced out with a piece of smooth wire, or oftener with the spine obtained from some tree,—as the thorny point of the bromelia leaf.
In about a week the shoes are ready to be taken from the last; and this is accomplished at the expense and utter ruin of the latter, which is broken into fragments, and then cleaned out. Water is used sometimes to soften the last, and the inner surface of the shoe is washed after the clay has been taken out.
Bottles are made precisely in the same manner,—a round ball, or other shaped mass of clay, serving as the mould for their construction. It requires a little more trouble to get the mould extracted from the narrow neck of the bottle.
It may be remarked that it is not the smoke of the palm-nuts that gives to the india-rubber its peculiar dark color; that is the effect of age. When freshly manufactured, it is still of a whitish or cream color; and only attains the dark hue after it has been kept for a considerable time.