868 TjiA.ysACTioys of tue Ameeican Institute. 



greater facility, and tlie mortar thus made sets quicker and is more 

 solid. 



Bronzing Porcelain. 

 Bottger gives a simple process for bronzing porcelain, stoneware, 

 and composition picture frames, which consists in covering the arti- 

 cles with a thin solution of water-glass, applied with a soft brush, 

 and then "sprinkling the surface with bronze powder. The article is 

 next heated, and when the silicate of soda or water glass is dry the 

 ])ronze will become firmly attached, and may then be polished or 

 burnished with agate tools. 



Oxygenated Water in the Atmosphere. 

 M. Struve sends to the French Academy some interesting facts 

 from Tiflis, the capital city of Georgia in Asiatic Russia, observed 

 by him in reference to the quantity of nitrate of ammonia, ozone, 

 and oxygenated water (peroxyd of hydrogen) present in rain water 

 obtained from melting snow and hail. The author used oxyd of 

 lead as a test, which was converted into peroxyd. 



Solubility of Sulphur in Coal Oils. 

 M. Pelouze has sent a paper to the French Academy of Sciences 

 on the solubility of sulphur in oils derived from coal. lie shows 

 that the denser the oil the greater the quantity of sulphur dissolved 

 at equal temperatures. Thus, at 100*^ Centigrade, or 212* Fahr., oil 

 of the density of 1,020 will dissolve as much as fifty-four per cent^ 

 while a light benzine, having a density of 0,870, will not dissolve 

 more than 15^ per cent. At 110'^ C, the power of solution of cer- 

 tain oils is as much as 115 per cent, and above 120'-' C, or 2-18'' F., it 

 is almost unlimited. 



Material for Staining Glass and Faience Ware. 

 According to the analysis made by Dr. II. Schwartz, the substance 

 producing a bright brown color was found to consist, in 100 parts, of 

 oxyd of chromium, 11.30; peroxyd of iron, 21.00; alumina, 18.02; 

 oxyd of zinc, 50.90. This material is prepared by dissolving in water 

 71 ounces of chrome alum, 60 ounces of persulphate of iron, ICO 

 ounces of alum, and 180 ounces of sulphate of zinc, which, after 

 having been mixed and precipitated by means of carbonate of soda, 

 are collected on a filter, washed, dried, gently ignited, and rubbed to 

 a powder in an agate mortar. 



