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Here the river winds along an ancient valley with gently sloping sides and a wide alluvial floor perhaps a mile or so in width, and there it enters a young, rock-walled gorge, whose rocky bed may be crossed by ledges over which the river plunges in waterfalls and rapids. It is unfortunate for astrology that, despite the asserted careful comparison of events with the planetary positions preceding and indicating them, nothing was ever observed which seemed to suggest the possibility that there may be an unknown planet ruling very strongly the affairs of men. But animals or plants which thus differ in a state of nature are always classed as distinct species, and thus we see how, by the continuous survival of the fittest or the preservation of favoured races in the struggle for life, new species may be originated. Additional evidence tending to support this concept exists in the cutting tool (fig. The blows of the waves are not struck with clear water only, else they would have little effect on cliffs of solid rock. Among wild animals the skunk varies considerably in the amount of white on the body, and this too was found to be usually greatest on the left side.