Part 27 (1/2)

What do you mean by Carbon?

A simple substance, whose most common form is purified charcoal: it is, in fact, the base of charcoal, divested of all ias, forh all ani them to a red heat In its pure, crystallized state, it constitutes the dia the so-called lead-pencils[14]

[Footnote 14: See Chapter XIV, article Diaen?

Air, aseous substance which composes the atmosphere, is foren, or Azote, the other Oxygen

Oxygen is, therefore, an eleh nature, and its different combinations are essential to anient in nature, and the principle of acidity and coen to life, that it is often called vital air

_Agent_, an actor; a person or thing possessing the faculty of action

_Essential_, necessary

What are the properties of Nitrogen or Azote?

Nitrogen is a substance also generally diffused through nature, and particularly in ani or exposed to it This gas, coht, heat, nor combustion, but serves to dilute the others: of itself, it is hurtful to anien makes the principal part of the salt we call _nitre_

What is meant by Combustion?

The decomposition of bodies by the action of fire; the union of coreater access the air has to a burning body, the more rapid and co fire

_Access_, the

Are all bodies equally combustible?

No; soht flaetables, resins, oils, fats, &c; others with difficulty, and without any sensible flame, as soot, coal, the ashes of plants, &c There are bodies, also, which are inco fire, as some alkalies, earths, &c

What is Caloric?

Caloric is that invisible agent which produces the sensation of heat

It exists in all bodies; it is a force we are ever in want of, and thus it is hid in everything around us, and penetrates all matter, however different may be its nature or properties

What is ases Some are salutary, butfro of charcoal; corrupted air at the bottohts our streets, churches, shops, &c, is procured chiefly fro passed through ht is required: escaping at the orifice prepared for it, it is lighted anted, and burns with, a brilliant flaen of the air, coen and oxygen exist and combine

_Salutary_, wholesome, healthful