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Speciforyo Directory 03
Page 08
More interesting to me than the river itself were the wonderful effects of the ever-changing light in the sky. I saw no more the wonderful radiations which had given me so much pleasure in Matto Grosso, but we beheld here a great haze of delicate tones up to a great height and a light blue sky above it. The clouds seemed to possess no well-defined form, but were more like masses of mist, the edges blending gradually with the blue of the sky. Only to the west was there an attempt at globular formation in the clouds. The clouds of heavy smoke which rose and rolled about over the landscape helped to render the otherwise monotonous scene a little more picturesque.
omewhat higher than the fish in the scale of life is the frog. Although he begins life as a fish, and in the tadpole state breathes by gills, he soon discards the water-diluted air of the pond, and with perfect lungs boldly inhales the pure air of the upper world. His life as a tadpole, although so fish-like, is much inferior to true fish life: for though the fish has not the perfect lung, he has a modification of it which he fills with air, not for breathing purposes, but as an air-sac to make him float like a bubble in the water. Will he rise to the surface? he inflates the air-bladder. Will he sink to the bottom? he compresses the air-bladder. But in the frog the air-bladder changes into the lungs, and is never the delicate balloon which floats the fish in aqueous space. When the frog's lungs are perfected, his gills close, and he forever abandons fish-life, though being a cold-blooded creature he needs comparatively little air, and delights to return to his childhood's home in the bottom of the pond. But although he can stay under water for a long time, he is obliged to hold his breath while there, and when he would breathe must come to the surface to do so. It is possible to drown him by holding him under water.
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