While there is such a persistency to ordinary observation, it would also appear that nature has a power of producing new varieties, though this is on… - Robert Chambers

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While there is such a persistency to ordinary observation, it would also appear that nature has a power of producing new varieties, though this is only done rarely. Such novelties of type abound in the vegetable world, are seen more rarely in the animal circle, and perhaps are least frequent of occurrence in our own race.