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This Book List Sectory 10
Page 10
In so far as this is a process of growth, accompanied by the assumption of a definite form, it might be compared with the growth of a crystal of salt in brine: but, on closer examination, it turns out to be something very different. For the crystal of salt grows by taking to itself the salt contained in the brine, which is added to its exterior; whereas the plant grows by addition to its interior: and there is not a trace of the characteristic compounds of the plant's body, albumin, gluten, starch, or cellulose, or fat, in the soil, or in the water, or in the air.
Once started in the launch _Rimac_, we went through interesting channels, outlets of the main stream being often noticeable on either bank, cutting wide passages through the forest and forming one or more shallow lakelets, with innumerable aquatic plants on the surface of the water. As we went farther it became easy to understand how islands were constantly forming in the river. Quantities of large and small logs of wood were continually floating down the stream; the banks were gradually being eaten away by the current. Whole trees fell down with their immense branches and polypi-like roots, and formed a barrier arresting the progress of the floating wood. Particles of earth deposited by wind and by water saturated with impurities settled there. Soon grass would begin to grow on those deposits, which quickly collected more deposits of flying and floating particles. The soft bottom of the river, disturbed by the deviated current, piled up mud against the submerged branches resting on the river-bed. Quickly an island was then formed; more wood accumulated, more grass, more mud; the base of the islands would increase rapidly, and in the space of a few years islands several kilometres in length rose above the water.
The woods hold not such another gem as the nest of the humming-bird. The finding of one is an event to date from. It is the next best thing to finding an eagle's nest. I have met with but two, both by chance. One was placed on the horizontal branch of a chestnut-tree, with a solitary green leaf, forming a complete canopy, about an inch and a half above it. The repeated spiteful dartings of the bird past my ears, as I stood under the tree, caused me to suspect that I was intruding upon some one's privacy; and following it with my eye, I soon saw the nest, which was in process of construction. Adopting my usual tactics of secreting myself near by, I had the satisfaction of seeing the tiny artist at work. It was the female, unassisted by her mate. At intervals of two or three minutes she would appear with a small tuft of some cottony substance in her beak, dart a few times through and around the tree, and alighting quickly in the nest arrange the material she had brought, using her breast as a model.
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