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This Book List Sectory 05
Page 12
My men were paddling away with great vigour and were making rapid progress, the river flowing almost all the time northward, with deviations of a few degrees toward the east, in stretches from 2,000 to 6,000 m. in length. We crossed an immense basin 1,500 m. broad with most gorgeous sand beaches. Their formation in small dunes, occasionally with an edge like the teeth of a double comb, was most interesting. Once or twice we came to musical sands such as we had found before. Everywhere on those beaches I noticed the wonderful miniature sand plants, of which I made a complete collection.
In No. 4 we have an illustration of the tube-mouth or Solenostoma, one of the two known kinds of fish in which the female shows a sense of her position as a mother. The tube-mouth, as you can see at a glance, is a close relation of our old friend the seahorse, whose disguised and undisguised forms in Australia and the Mediterranean we have already observed when dealing with the question of animal masqueraders. Solenostoma is a native of the Indian Ocean, from Zanzibar to China. In the male, the lower pair of fins are separate, as is usual among fish; but in the female, represented in the accompanying sketch, they are lightly joined at the edge, so as to form a sort of pouch like a kangaroo's, in which the eggs are deposited after being laid, and thus carried about in the mother's safe keeping. No. 5 shows the arrangement of this pouch in detail, with the eggs inside it. The mother Solenostoma not only takes charge of the spawn while it is hatching in this receptacle, but also looks after the young fry, like the father stickleback, till they are of an age to go off on their own account in quest of adventures. The most frequent adventure that happens to them on the way is, of course, being eaten.
We crossed two streamlets flowing west. Benedicto and Filippe were in such a bad way that it was breaking my heart to look at them. Every time they fell down in a faint I never knew whether it was for the last time that they had closed their eyes. When I felt their hearts with my hand they beat so faintly that once or twice I really thought they were dead. That day I myself fainted, and fell with the left side of my face resting on the ground. When I recovered consciousness some time later, I touched my face, which was hurting me, and found that nearly the whole skin of my cheek had been eaten up by small ants, the lower lid of the eye having suffered particularly. A nasty sore remained on my face for some two months after that experience, the bites of those ants being very poisonous.
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