We had a delicious breakfast of fish—really excellent eating—which set everybody in a good humour, and then we proceeded over slight undulations (elev. 1,250 to 1,300 ft.) through forest until we got to the Ponte Alto (High Bridge) River, so called because..., there is no bridge whatever there! The Brazilians are really too delightful in their reasoning; and, mind you, it is not done with a mischievous sense of the ludicrous—indeed no; it is done seriously. The Ponte Alto stream was, like most of the other watercourses of that region, wonderfully limpid.
From that point we were in charming open country, where we could freely breathe the delicious air. Occasionally we saw some angelin trees (the Angelino amargoso and Angelino pedra), technically known as Andira vermifuga M. and Andira spectabilis Sald.
Nearly all the woods we found had a high specific gravity: the two latter, for instance, 0·984 and 1·052 respectively, and a resistance to crushing of kilos 0·684 and kilos. 0·648.
Cacti of great size were numerous. We were now in a region where termite-hills (ant-hills) were to be seen in great numbers. They stood from 2 to 3 ft. above ground, although occasionally some could be seen nearly double that height. Some of the ant-heaps were extraordinary in their architecture, and resembled miniature castles with towers and terraced platforms. Whether they had been built so by the ants or worn down to that shape by the pouring rain and wind, was not so easy to tell.
The more one saw of the termites, the more one disliked them, for they were the most insidious, destructive little brutes of that region. They were ugly in appearance, with their fat white bodies of a dirty greenish-white colour. Nevertheless one could not help having great admiration for those little rascals, which in one night were able to devour the bottom of stout wooden boxes, and in a few hours damaged saddles, clothes, shoes, or any article which happened to be left resting for a little while on the ground. They were even able to make an entire house tumble down in a comparatively short time if the material used in the construction were wood.
Yes, one hated them; yet, when one knew all about them, one had to spend hours watching their doings with a microscope, it was so interesting. They seemed to have two social classes among them—the labouring class and the warriors. To the labourers was given the heavy task of digging underground channels, the surplus earth of which was thrown up with great force through apertures in the soil until the earth so displaced and amassed formed a high heap, riddled in its interior by hundreds of channels and miniature chambers and apartments. To the warriors—really more like a kind of perfect police service—was entrusted the safety of the colony and principally the protection of the young. White ants have many enemies, especially among the larger ants, which carry on regular wars against them; for although ants and termites—commonly called white ants—have many points in common, yet they belong to totally different orders of insects, as can be easily noticed in their structure and development. The peculiar structure of the enlarged heads of the warrior termites was particularly noticeable. Some had a formidable head provided with tentacles and powerful rodent clippers—as well as the peculiar whitish cuirasses in sections of the body. The workers had more normal shapes, the head being better proportioned with the body.
It was enough to split one of the heaps and watch the termites at work to learn a lesson of what devotion and duty mean. In the many passages overcrowded with ants—there was never confusion—you saw hundreds of them, either conveying food or building materials to the various quarters. Some carried leaves, others carried pieces of wood, seeds, or dead insects. If one was not strong enough to convey its load, others came to its assistance—although they generally seemed to resent the intrusion of others in doing their work. I always noticed that when one was in difficulty and others ran to the rescue there generally ensued what seemed to be a row, and the new arrivals hurriedly left—either disgusted or angry, I could not tell which by their minute expression.
Then there were extraordinarily fat lady ants, lying flat upon their backs, and with many attendants around them doing massage and general nursing with the greatest possible gentleness and care. If one wanted to see a great commotion one only had to introduce into one of the chambers a larger ant of a different kind. What struck me was that the moment the fray was over the termites at once—if perhaps a little more excitedly—resumed their work.
What astonished me more than anything was that they would go on working at all—as if nothing had happened—when I split open one of their dwellings and many of the channels, which must have been normally in the dark—were now exposed to the light. This made me suspect that their vision was either missing altogether or was very defective.
Nature is a wonderful organizer. The majority of termites—including warriors and workers—were sexless; that was perhaps why they were such good workers, as they had nothing to distract them. The males and females whose duty was merely to propagate and improve the race were provided temporarily with wings, so that they could fly away from the colony and disseminate their love among other winged termites of other colonies. The relation between different colonies was friendly. When their task was accomplished and flight was no more necessary for them, they conveniently and voluntarily shed their wings, leaving merely a small section of the wing root attached to the thorax.
