i i ees | 
a nen 
Geology and Mineralogy of a part of Massachusetts, &c. 53 
32. CLAY. 
: a4 1. Porcelain Clay. 
In Savoy, in a bed three feet deep and of unknown ex- 
tent, several feet below the surface. iscovered in dig- 
ging for ore, connected with mica slate. It resembles the 
porcelain clay of Monkton, Vt. It forms a very cohesive 
paste, white, and crucibles moulded from it and burned in 
a common fire were sonorous when struck. It contains 
coarse Reig = of quartz, but when sifted, forms a very 
fine 
Similar clay of a finer quality has been hae ~~ ty 7 
said to be found in large quantity in Canaan 
am 2 gama with the locality. hes in "Plainfield; 
orter. 
2. Potters’ Clay. 
Abundant generally. 
. 3. Lithomarge ? 
A clay, much resembling Lithomarge, is found in the 
iron ore in the W. part of Bennington. I saw none of it at 
the great orebed. 
4, Yellow Earth. 
When washed, a yellow ochre is deposited from the wa- 
ter. Williamstown. 
CLASS III. 
1. SULPHURETTED HYDROGEN GAS. 
fn the hepatic waters mentioned in the Geol. Sketch. 
2. SULPHUR. 
Hinsdale, in cavities of a mica slate rock, consisting” 
chiefly of quartz. It is a brown powder, from ‘its mixture, 
