TERRA-COTTA, BRICK, ETC. 
133 
bridge clay. The following analyses show the composition 
of the celebrated Stourbridge and other foreign clays :— 
1.* 
a.t 
34 
44 
Silica, 
Alumina, 
Potash, 
Lime, 
Magnesia, 
Protoxide of iron, .... 
Phosphoric acid, .... 
Water and organic matter, 
65.10 
22.22 
.18 
.14 
.18 
| 1.92 
.06 
9.86 
73. 
19.93 
.89 
.39 
.87 
6.40 
50.20 
34.13 
.39 
.30 
.87 
13.70 
51.90 
30.03 
.89 
1.60 
.18 
1.50 
13.90 
* English Stourbridge, Percy. t Coblentz, for glass-pots. 
f German clay for glass-pots, from Bremen, Germany. 
Note.—Numbers 2, 3 and 4, made in the New Jersey State Labo- 
ratory. 
Ceramic Enamels. 
Chemisch-technische Fabrik bei Elbogen in Böhmen. 
Director, Max Rösler. C. F. Merker, Agent, 1 Getreide 
markt, Vienna. There was from this source a very inter- 
esting exhibition of coloring materials for the use of potters 
and decorators, which was honored with the Progress Medal. 
The highest skill of the chemist is called for by this art, 
and the demand is such that the manufacture of Standard 
colors, or enamels, ready for use, has become an important 
industry. V large glass case was filled with a collection 
of the manufactures of their establishment, consisting of 
fluxes, glazes, colored glazes and enamels, and metallic 
oxides for glass, porcelain, stoneware and majolica. These 
are accompanied by proof-tiles, upon which the colors have 
been tested by burning, showing all the colors and shades 
of color—the greens, blues, red, rose, yellow, etc., etc. 
All the preparations of chromium, copper, mercury, gold 
and cobalt were beautifully displayed. By the courtesy 
of the director I have been favored with a price-list, from 
which I make the following extracts for the benefit of ama- 
teur decorators and others, who have found difficulty in 
getting such materials in the United States.