They have sacks, a foot long, made of a pretty close cloth, which they fill with this liquid thick matter, and hang them on nails round the indigo-house. The water drains out gradually; and the matter which is left behind, resembles a real mud, which they take out of these sacks, and put in moulds, made like little drawers, two feet long by half a foot broad, and with a border, or ledge, an inch and a half high. Then they lay them out in the sun, which draws off all the moisture: and as this mud comes to dry, care is taken to work it with a mason's trowel: at length it forms a body, which holds together, and is cut in pieces, while fresh, with wire. It is in this manner that they draw from a green herb this fine blue colour, of which there are two sorts, one of which is of a purple dove colour.
Of Tar; the way of making it; and of making it into Pitch.
I have said, that they made a great deal of tar in this colony, from pines and firs; which is done in the following manner. It is a common mistake, that tar is nothing but the sap or gum of the pine, drawn from the tree by incision; the largest trees would not yield two pounds by this method; and if it were, to be made in that manner, you must choose the most thriving and flourishing trees for the purpose; whereas it is only made from the trees that are old, and are beginning to decay, because the older they are, the greater quantities they contain of that fat bituminous substance, which yields tar; it is even proper that the tree should be felled a long time, before they use them for this purpose. It is usually towards the mouth of the river, and along the sea-coasts, that they make tar; because it is in those places that the pines chiefly grow.
When they have a sufficient number of these trees, that are fit for the purpose, they saw them in cuts with a cross-cut saw, about two feet in length; and while the slaves are employed in sawing them, others split these cuts lengthwise into small pieces, the smaller the better. They sometimes spend three or four months in cutting and preparing the trees in this manner. In the mean time they make a square hollow in the ground, four or five feet broad, and five or six inches deep: from one side of which goes off a canal or gutter, which discharges itself into a large and pretty deep pit, at the distance of a few paces. From this pit proceeds another canal, which communicates with a second pit; and even from the first square you make three or four such trenches, which discharge themselves into as many pits, according to the quantity of wood you have, or the quantity of tar you imagine you may draw from it. Then you lay over the square hole four or five pretty strong bars of iron, and upon these bars you arrange crosswise the split pieces of pine, of which you should have a quantity ready; laying them so, that there may be a little air between them. In this manner you raise a large and high pyramid of the wood, and when it is finished, you set fire to it at the top. As the wood burns, the fire melts the resin in the pine, and this liquid tar distills into the square hole, and from thence runs into the pits made to receive it.
If you would make pitch of this tar, take two or three red-hot cannon bullets, and throw them into the pits, full of the tar, which you intend for this purpose: immediately upon which, the tar takes fire with a terrible noise and a horrible thick smoke, by which the moisture that may remain in the tar is consumed and dissipated, and the mass diminishes in proportion; and when they think it is sufficiently burnt, they extinguish the fire, not with water, but with a hurdle covered with turf and earth. As it grows cold, it becomes hard and shining, so that you cannot take it out of the pits, but by cutting it with an axe.
Of the Mines of Louisiana.
Before we quit this subject, I shall conclude this account by answering a question, which has often been proposed to me. Are there any Mines, say they, in this province? There are, without all dispute; and that is so certain, and so well known, that they who have any knowledge of this country never once called it in question. And it is allowed by all, that there are to be found in this country quarries of plaster of Paris, slate, and very fine veined marble; and I have learned from one of my friends, who as well as myself had been a great way on discoveries, that in travelling this province he had found a place full of fine stones of rock-crystal. As for my share, I can affirm, without endeavoring to impose on any one, that in one of my excursions I found, upon the river of the Arkansas, a rivulet that rolled down with its waters gold-dust; from which there is reason to believe that there are mines of this metal in that country. And as for silver-mines, there is no doubt but they might be found there, as well as in New Mexico, on which this province borders. A Canadian traveller, named Bon Homme, as he was hunting at some distance from the Post of the Nachitoches, melted some parcels of a mine, that is found in rocks at a very little distance from that Post, which appeared to be very good silver, without any farther purification.[50]