The black paint which the Indians used for smearing themselves across the forehead, cheeks, and upon the shoulders, from side to side, was made to stick to the skin and shine by mixing it with a resin.
The Bororos of the Rio Barreiros district carried five arrows each with them, but each family of Bororos used a special colour and also a different number of arrows, so that no particular rule could be laid down for the entire tribe. The red-tinted arm-band which most men wore was called the aguasso.
Before starting on a hunting expedition of importance the Bororos usually indulged in a feast.
I took a great number of thumb-marks among them, some of which were remarkable for the precision of the spiral lines from the central point, all over the thumb point. Others in the longer thumbs showed a peculiar deviation in the curve at the end, near the point of the thumb. Where the lines began to deviate, the triangle formed was filled in by other lines joining those of the spiral at sharp angles.
The experiments with the dynamometer in order to measure their strength, the anthropometric measurements with a calliper, and the printing of the thumb-marks, caused the Bororos first of all great anxiety, then boisterous amusement. They looked upon it all as utter nonsense—in a way I did not blame them—and repeatedly asked why I did it. I told them that I did it to find out where they came from.
"We are not monkeys," said they; "we do not walk on our hands. If that is your object you should look at our foot-marks on the ground, not at the marks of our hands!"
With these words, from a tracker's point of view, the local wit set the entire company in shrieks of laughter at his quick repartee.
"Oh, yes!" said I; "but with the thumb-marks I may perhaps trace, not only where you come from, but also where your great-grandfather, who is now dead, came from."
That was too much for them. All had been anxious to make a smudge with smoke-black upon my note-book. Now they all refused to do any more thumb-marking, and walked away; but I had fortunately already finished the work I needed from them.
The Bororos—in fact, most Indian tribes of Central Brazil—knew nothing whatever of navigation. This was chiefly due to the fact that all the woods of Central Brazil had so high a specific gravity that not one of them would float. Hence the impossibility of making rafts, and the greatly increased difficulty in making boats. As for making dug-outs, the Indians had neither the patience nor the skill nor the tools to cut them out of solid trees. Moreover, there was really no reason why the Indians should take up navigation at all when they could do very well without it. They could easily get across the smaller streams without boats, and they were too timid to go and attack inimical tribes on the opposite banks of unfordable rivers. Besides, the Indians were so few and the territory at their entire disposal so great, that there was no temptation for them to take up exploring, particularly by water.