The early green glass of the Rhine and Holland, while made by German-speaking people, cannot be considered as characteristic of German glass. These people lived on either side of the mountains which gird Bohemia on three sides, and divide that kingdom from Silesia, Saxony, and Bavaria respectively, and the glass they made was painted in beautiful colors, the finer kind being engraved in the upland countries, where water was abundant. Gilding was also much employed by them, and we learn that in the seventeenth and eighteenth centuries this decoration was fixed by a cold process; that is, by simply attaching the gold leaf by means of varnish. This form of decoration was only lasting when applied to the sunken parts of the glass. Very little of this glass was used in the section where it was manufactured, nearly the whole product being exported to Austria, Germany, Italy, the East, and even to America. The industry was popular in Bohemia, for it furnished labor to a part of the population, helping to keep them from want, and it procured for the rich landowners a revenue from the use of their woods. The factories, which were rudely built, were located in the center of forest tracts, and they produced, in addition to ordinary glass pieces, articles that were intended to be highly worked or richly engraved, also colored glass, decorated with gilding and painting. Long experience in the manufacture of colored glass had made these workmen expert in this branch, and any advice they needed, they obtained from men of information who made their living by seeking out and selling secrets concerning processes and improvements in glass manufacture. All capital required was advanced by rich lords, who were eager to insure the success of industries established upon their premises. Glass cutting and luster making were regarded as special trades, being carried on in huts beside small streams; and engraving, gilding, and painting likewise formed separate branches, all paid by the very lowest wages. Products of all the factories were collected by agents from commercial houses, and by them distributed among the various markets. Comparison between the Bohemian product and the older glass upon the market resulted strongly in favor of the former. It was clear, white, light, and of agreeable delicacy to the touch, and no other glass as purely colorless was made until the modern discovery of flint glass, made by the use of lead. Through the invention of one Gasper Lehmann, improved engraving on Bohemian glass became possible, opening a field for decorative art that hitherto had been undreamed of. With his pupil George Schwanhard, he improved designs, and the world went engraved-glass mad. Nothing but this type would sell, and as material became scarce, Venetian pieces, already a hundred years old, were brought into requisition and engraved.