In the colony at Tachos, situated on a height, there were several neat buildings for the friars and a village for the Indians. What interested me most was to see how much of the land around had been converted with success to agricultural purposes. I inspected the buildings where useful trades were taught to the Indians of both sexes. Weaving-looms and spinning-wheels had been imported at great expense and endless trouble, as well as blacksmiths' and carpenters' tools of all kinds. A delightfully neat garden with European flowers was indeed a great joy to one's eyes, now unaccustomed to so gay and tidy a sight. What pleased me most of all was to notice how devoted to the Salesians the Indians were, and how happy and well cared for they seemed to be. They had the most humble reverence for the Fathers.
Padre Antonio Colbacchini, the Father Superior, an Italian, was an extremely intelligent and practical man, one of the hardest workers I have ever met. With a great love for science he had established a small observatory on a high hill at a considerable distance from the mission buildings. The abnegation with which Father Clemente Dorozeski, in charge of the instruments, would get up in the middle of the night and in all weathers go and watch for the minimum temperature—their instruments were primitive, and they did not possess self-registering thermometers—was indeed more than praiseworthy.
My readers can easily imagine my surprise when one day Padre Colbacchini treated me, after dinner, to an orchestral concert of such operas as Il Trovatore, Aïda, and the Barbiere di Seviglia, played on brass and stringed instruments by Indian boys. The Bororos showed great fondness for music, and readily learned to play any tune without knowing a single note of music. Naturally great patience was required on the part of the teacher in order to obtain a collective melody which would not seriously impair the drum of one's ear. The result was truly marvellous. Brass instruments were preferred by the Indians. The trombone was the most loved of all. As the Indians all possessed powerful lungs, they were well suited for wind instruments.
The colony was situated in one of the most picturesque spots of Matto Grosso. When out for a walk I came upon a great natural wall of rock with immense spurs of lava, the surface of which was cut up into regular geometrical patterns, squares and lozenges. I think that in that particular case the peculiarity was due to the lava having flowed over curved surfaces. In coming in contact with the atmosphere it had cooled more rapidly on the upper face than the under, and in contracting quickly had split at regular intervals, thus forming the geometrical pattern.
It was undoubted that we were there in the former centre of inconceivable volcanic activity. In other parts of a great dome of rock I came upon strange holes in the rock—extremely common all over that region—which might at first glance be mistaken for depressions formed by glacial action, but which were not. They were merely moulds of highly ferruginous rock, granular on its surface and not smoothed, as one would expect in the walls of cavities made by the friction of revolving ice and rock. Nor did I ever find at the bottom of any of those pits, worn-down, smooth spherical or spheroid rocks, such as are usually found in pits of glacial formation. Those pits had been formed by lava and molten iron flowing around easily crumbled blocks of rock, or perhaps by large balls of erupted mud which had dropped on molten lava, that had then solidified round them, while the mud or soft rock had subsequently been dissolved by rain, leaving the mould intact. The latter theory would seem to me the more plausible, as many of those pits showed much indented, raised edges, as if splashing had taken place when the rock now forming the mould was in semi-liquid form. Only once or twice did I notice hollows with a suggestion of spiral grooves in their walls; but I think that those had been caused at a more recent date by water flowing in and describing a spiral as it travelled downward in the interior of the vessels.
On the hill where the observatory was situated two circular volcanic vents were to be seen. The hill, which had a slope on one side, had evidently been split, as on reaching the top I found that an almost vertical precipice was on the other side. Quantities of quartz and crystals were to be found on that hill. All over that region quaintly-shaped rocks were also to be found, some like small cubic or rectangular boxes, others not unlike inkstands, others in hollowed cylinders or spheres. Many—and those were the quaintest of all—were of a rectangular shape, which when split disclosed a rectangular hollow inside. These natural boxes were mostly of iron rock, laminated, which had evidently collected when in a liquid state round some soft matter, that had subsequently evaporated or disappeared with the intense heat, leaving empty spaces inside. The laminations were about one-eighth of an inch thick.
Padre Colbacchini told me that some distance off a curious pool of water existed which he called the "electric spring." When you placed your hand in it you received a slight electric shock, while a similar impression to that of an electric current continued to be felt as long as you kept your hand in the water.
The mission buildings at Tachos were at an elevation of 1,600 ft., the observatory, 100 ft. higher. The temperature on May 23rd was max. 81°, min. 68·4 Fahr. From the observatory hill an uncommon sight was before us. Seven large and small isolated conical and domed hills stood in perfect alignment from N.N.E. to S.S.W. in two different sets.
In that region the prevalent wind was from the E.S.E. during the months of May, June, July and August. In September the wind veered gradually to the north and north-east; whereas during the rainy season winds from the north, north-west and south-east were the most prevalent, especially the north-westerly wind. When the wind came from the north it was generally accompanied by heavy rain. The rainy season in that particular zone of the immense Matto Grosso state extended from October to the end of April.
The Rio Barreiros flowed in a northerly direction (elev. 1,500 ft.) over a bed of red lava, ashes, red earth, and sand. After leaving this river we quickly rose again to an altitude of 1,700 ft. upon a first hill, then to 1,800 ft. on a second, and 1,850 ft. on a third elevation over a great spur of red lava, extending in a graceful curve well into the valley below.
