Part 8

Chlorine. A gaseous element. Symbol: Cl.

Chlorophyll. The coloring-matter of green parts of plants.

Chromatic aberration. The colored fringe seen at the edges of images formed by a simple lens, because of the difference in wave lengths of the various rays.

Chromium. A metallic element. Symbol: Cr.

Chromo-. Color-, in many compounds. Also: chroma-, chromato-.

Chromosome. One of the small bodies formed out of a protoplasmic substance (chromatin) in the nucleus before a cell divides.

Civilization. An advanced stage of culture. Civilization is sometimes contrasted with culture, but the matter is one which cannot be considered here.

Class. A group of animals or plants, more comprehensive than an order and less so than a phylum.

Climate. The average weather conditions of a particular place or region.

Cobalt. A metallic element. Symbol: Co.

Coccus. A spherical bacterium. A sort of carpel.

Coelenterata. A phylum of invertebrate animals including the corals.

Cohesion. Molecular attraction within a body.

Colloid. Not crystalloid. A substance which does not form a true solution. Colloidal liquids have very little osmotic pressure.

Columbium or niobium. A metallic element. Symbol: Cb.

Combustion. Oxidation accompanied by the production of heat and light. Less frequently, the word is used for a combination which is not oxidation or where no heat or light is produced.

Common sense. Ordinary and non-scientific thought processes. Scientific thinking is more exact and more fertile.

Community. A social group.

Comparative. Involving comparison, as between man and the other animals.

Complex. In psycho-analysis, a cluster of ideas and mental images joined together by a stressed emotion; especially such a cluster that is thrust out of consciousness (repressed).

Component of a force. The effective value of a force in a given direction.

Compound. A substance consisting of two or more chemical elements in combination.

Compound animal, flower, leaf, etc. An animal, etc., consisting of a combination of organisms or simple parts.

Conation. Will, directing power, effort.

Concave. Curved like the interior of a circle or sphere.

Concept or conception. The idea, notion, or thought held about anything. Conception includes symbol and meaning.

Condense. Change from gas to liquid. Concentrate (electricity). Of organic compounds, react in a certain way so as to form new bonds.

Conduct. Carry heat or electricity.