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Gutta-Percha Tissue

If a solution of gutta-percha in chloroform be mixed with 3 parts of ether and exposed for some time to a temperature below 15° Fahr., the gutta-percha will be precipitated as a white powder, forming, when washed and dried, a soft white mass. If some of this solution be spread on a plate of glass, a skin is formed, reorder: Copper, zinc, cloth, and so on. The sembling kid-glove leather, which becomes relative position of the metals in each pair transparent on the application of heat. These must be observed throughout the whole series, so that, if the pile commences with a copper plate, it shall terminate with a zinc one.

These two extremes are called the poles.

Zinc is called the positive pole, and copper the negative pole. The outer disks are connected with copper wire, that the electric or galvanic stream which is excited in the pile may be conveyed to any place desired. When the two ends of the wires are brought very near to each other, sparks are seen to dart films are beautifully white if carefully prepared, and have been employed in the manufacture of the finest kinds of artificial flowers.