Toward the middle of the eighteenth century Dr. Haberden, of London, confirmed the deductions of Lémery and the somewhat later experiments of the German physicist Aepinus, and the gay world of London took up the idea, causing the new stone to become a great favorite with the fashionable. One of Hogarth’s inimitable designs depicts a spendthrift fop who has just been arrested while his attention was riveted on the strange phenomena shown by the tourmaline.
In view of the important experiments made by Benjamin Franklin in the then almost unexplored field of electricity, it is easy to understand that the accounts of the newly-discovered electric properties of the tourmaline should have possessed considerable interest for him. This is testified to by a letter he addressed to Dr. William Haberden, June 7, 1759.[[102]] Herein he expresses his thanks for two tourmalines his correspondent had sent him, and states that he is returning the smaller one. Of the electric phenomena he writes that he had heard some “ingenious gentlemen abroad” had denied the negative electricity displayed by one side of a tourmaline, but he believes the failure to observe could be explained by defective cutting of the specimens used, the positive and negative planes having perhaps been obliquely placed; to obviate this he suggests that the positive and negative sides should be accurately determined before the operation of cutting begins. The larger of the specimens sent by Dr. Haberden was retained by Franklin, who had it mounted on a pivot in a ring, so that either side could be turned outward at will. He notes as a curious circumstance that when he wore this ring, the natural heat of the finger sufficed to charge the stone, causing it to attract light bodies. Several of his experiments were made with a cork ball suspended by a thread, and he claims that the attractive force of the positive face was increased by coating it with gold-leaf attached to the stone by white of egg. This greater effect he supposed “to be occasioned by the united force of the different parts of the face collected and acting together through the metal.”
While the various corundum gems, ruby, sapphire, Oriental topaz, Oriental amethyst, etc., offer a remarkable instance of the many varieties of beautiful coloration observable in a practically identical substance, no single gem-mineral can be said to equal tourmaline in this respect, more especially, however, in the combination of several colors sometimes disposed in bands, at other times in concentric circles in the same crystal. When to this we add its peculiar electric qualities, we may truly say that a fine tourmaline answers our idea of what a talismanic gem or a gem-amulet should be better than any other of the beautiful crystals with which bountiful nature has provided us. These most attractive stones are to be found in widely separated regions on the earth’s surface, as fine examples have been discovered in the State of Minas Geraes, Brazil, and in our own land, in Maine and California especially. Where the color is homogeneous we may have the splendid red or rose-colored variety called rubellite, from its resemblance to the ruby, or the blue tourmaline gem named indicolite.
In times of old there was a belief that stones of various kinds would guard against the assaults of evil in the form of witchcraft, disease, and other disagreeable visitations. It was a warlike period in which peace was an unheard-of doctrine, and now that the idea of peace has become one of the ideals of present-day conditions, it is interesting to know that nature has furnished us with a stone at once beautiful, interesting, and illustrating the great fundamental principle of unity and peace.
The Peace Stone is formed by the union in one crystal of the green and the red tourmaline, with an intervening band or zone of white, the latter strikingly beautiful effect being due to the combination at this point of the red coloring matter, manganese, and the iron constituent, the source of the green hue; these two materials, by their union, neutralize each other, furnishing the transparent, colorless vein or zone. A slightly different combination of colors appears in a fine crystal, found some years ago at Mount Mica, Oxford County, Maine; this even offers a kind of “triple alliance,” as it shows blue in its lower half, passing through white and pink to a grass-green at the upper end.[[103]]
These three hues combined in one body, in indissoluble union in spite of the differences of quality and color, yet represent one principle. This action of manganese in neutralizing the iron is well known to glass-makers; otherwise white glass could not be made. It would all be greenish in tint were it not for the use of oxide of manganese, or “glass-maker’s soap,” as it is termed, which neutralizes the production of a green tint by the iron and makes the white hue.
This beautifully symbolic stone is found in Paris, Maine, in San Diego County, California, and in Brazil. At times the outer edge of the stone is green, a transparent white zone surrounding the interior red zone, the whole looking for all the world like a section of watermelon, and hence it is sometimes called the “Watermelon Stone.” Then again, the colors are joined in longitudinal strips, showing them side by side. This variety of tourmaline, although rare, is not especially costly, and is one more addition to the stones of sentiment, and more especially to those appropriate as symbols of our fair ideal, universal peace.
We can see symbolized in them the great and consoling fact that, however marked may be the differences between any two peoples, they need not be cause for enmity, but may instead become true and enduring sources of peace and bonds of union. The characteristic talents of each one will supplement and complete those of the other, so that working together in harmony they may accomplish far more for each other and for humanity in general than either could do singly.
At an early date amber was brought from the Baltic coast to Rome, and Tacitus states that those who collected it called it glæsum, a name later applied to the glass introduced into that region by Roman traders. The natives knew nothing of the nature or growth of amber, and had no use for the material, only collecting it for export to Rome, where it commanded such a high price as to excite their astonishment. Tacitus gives in the following words his theory of the origin and character of amber—his chief error being due to his belief that the substance was of very recent formation.[[104]]
Now you must know that amber is a juice of trees, since various creatures, some of them winged, are often found in it. They have become entangled in the liquid and then inclosed when the matter hardened. Therefore I believe that, as incense and balsam are exuded in the remote East, so in the luxuriant groves and islands of the West are juices which are forced out by the sun close to them. These flow into the neighboring sea and are washed up by the tempestuous waves on the opposite shore. If you test the quality of amber with fire, it may be lighted like a torch and burns with a small, well-nourished flame; then it is resolved into a glutinous mass resembling pitch or resin.