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The endless diversity which the hand of Nature has diffused through all her works, even when she makes use of the same primitive materials, must sufficiently convince us, that, whatever accuracy we may attain in the knowledge of the latter, the means which she employs to form her combinations are still secret. The intellectual eye may indulge in the contemplation of hypothetic systems, which itself has created, and which it alone can behold; but, how far removed must they ever be from truths, evident to our senses, and supported by palpable experiments. To follow Nature through the minutiæ of her labours, and behold her reproducing the same primitive materials in many different shapes, has always been deemed a less splendid achievement of science, than to discover one more of those simple substances, by the union of which she forms the complicated effects we daily admire. Yet to me it appears, that, in no instance is she more truly wonderful, than in the unbounded variety which she has sometimes produced from a small fund of original resources; and, when we can fairly follow a few primitive substances, through a series of combinations infinitely multiplied.

philosophical transactions of the royal society of london

XI. Analysis of the arseniates of copper, and of iron, described in the preceding paper; likewise an analysis of the red octaedral copper ore of Cornwall; with remarks on some particular modes of analysis