Before closing, we may allude to the repeated failure of permanently establishing window- and bottle-glass works in this vicinity. The primary cause has been in the construction of the furnaces, no improvement for centuries having taken place, but the old defective plan being adhered to by workmen from Europe. A casual observer must see they are defective, and consume double the quantity of fuel really required for the weekly melts. The rate of wages for experienced workmen, about threefold over the German rates, has heretofore checked success, but at the present time is more than compensated by machinery and materials. The manufacture of plate-glass offers a profitable and inviting field that should be improved. The consumption in this country is large and increasing yearly. Materials are cheaper than in Europe, and as the most essential part is performed by machinery and motive power, this will more than equalize the extra rate of wages that may be taxed upon a new undertaking. We have recorded the rise and progress of the Glass Manufacture in the Atlantic States, showing its course from its introduction in 1812 to the present period, _i.e._ 1852, covering a space of time of just forty years. We now turn to the introduction of the manufacture in the Western States, for the account of which we are indebted to Mr. Thomas Bakewell, of Pittsburg, Penn. Mr. Bakewell advises us, that, prior to the year 1808, glass-works were established by a company of Germans, near Fredericktown, Maryland, under the direct control of a Mr. Amelong, for the purpose of manufacturing glass in all its branches. We have not ascertained the precise year in which Mr. Amelong commenced the manufacture; but previous to the year 1808 the establishment was broken up, and the workmen dispersed. Most of them reached Pittsburg, Penn., and a part of them were engaged by Col. James O'Hara, in the establishment of the first window-glass factory in the Western States. The same factory is in operation to the present day, and others of the Fredericktown company were instrumental in introducing the same branch of the glass business into Pennsylvania, at New Geneva, upon the property of the late Albert Gallatin. Others of the number, previously mentioned, established themselves in Baltimore, and in all of the places noticed. Some of their descendants still continue the business. There are at this time ten window-glass factories in the vicinity of Pittsburg, and fifteen in the river towns,--in all twenty-five works,--manufacturing over 220,000 boxes of window-glass of 100 feet each annually.