CHEMICAL TERMS EXPLAINEIT. 



Gas. All the airs, or vapour separated from bcwlies by 

 means of heat or any chemical process, if they differ in theii 

 properti^ from the air of the atmosphere, are called gasses. 



Carbonate of Lime. This substance, under the name of 

 marble, chalk, limestone, «&c. exists in great abundance various- 

 ly mixed with other bodies. It is often found chrystilized, and- 

 perfectly transparent. It has scarcely any taste. It i^ insolu- 

 ble in pure water. See Bergman, 1st. 26^ for further exjilanas- 

 tion. 



Calcarious. A term used to describe chalk, marble, and al 

 other combinations of lime with carbonic acid. 



Carbonic Acid. A combination of carbon and oxygen. 



Carbon, Thebasis of charcoal. 



Oxygen. A simple substance, composing the greatest part 

 <yf water, and part of atmospheric air. 



Argillaceous. A term descriptive^of those earths which con- 

 tain aktmine, or clay. 



