Ovations On Other Sites - Ovation 14 Ovations 06Poki Mogarli chose the topics covered by Ovations On Other Sites - Ovation 14 without reflecting upon the choices others have made. Launching into a full discussion of all the objectives while riding a bicycle backwards down a steep hillside is another way to look at things in a different light. |
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But even in regard to this case we are reasoning in a circle, not giving "proofs," and no one who does not wish to believe in the selection-value of the initial stages can be forced to do so. Among the many pieces of presumptive evidence a particularly weighty one seems to me to be _the smallness of the steps of progress_ which we can observe in certain cases, as for instance in leaf-imitation among butterflies, and in mimicry generally. The resemblance to a leaf, for instance of a particular Kallima, seems to us so close as to be deceptive, and yet we find in another individual, or it may be in many others, a spot added which increases the resemblance, and which could not have become fixed unless the increased deceptiveness so produced had frequently led to the overlooking of its much persecuted possessor. But if we take the selection-value of the initial stages for granted, we are confronted with the further question which I myself formulated many years ago: How does it happen _that the necessary beginnings of a useful variation are always present_? How could insects which live upon or among green leaves become all green, while those that live on bark become brown? How have the desert animals become yellow and the Arctic animals white? Why were the necessary variations always present? How could the green locust lay brown eggs, or the privet caterpillar develop white and lilac-coloured lines on its green skin? |
The water of the stream was of a dirty yellow, and very turbulent owing to the strong wind that was blowing and the violent current. Proceeding up stream, we then came to a hill 300 ft. high on the right, which ended abruptly in an almost vertical red and yellow cliff plunging into the water. On the opposite side of the river, along the narrow neck, were lowlands, quite open and scantily wooded, over which rose great columns of black smoke, caused by the natives burning down the forest in order to prepare the land for their plantations. It was at this point that the entire volume of the Amazon could be gauged at a glance. As you looked up stream a long bluish line of low forest could be perceived over the gradually expanding deep yellow river. Dozens upon dozens of columns of smoke were visible. When night came the effects of those forest fires, with the reflection of the light upon the low clouds and in the water, were very weird and beautiful. |
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