If a description of the human body must include the description of what it, and all its 'parts,' are doing—that is, of its behavior—this behavior will be one thing in the open air but quite another in a vacuum, in a furnace, or under water. Blood in a test-tube is not the same thing as blood in the veins because it is not behaving in the same way. Its behaviour has changed because its environment or context has changed, just as the meaning of one and the same word may change according to the kind of sentence in which it is used. There is a vast difference between the bark of a tree and the bark of a dog. It is not enough, therefore, to describe, define, and try to understand things or events by analysis alone, by taking them to pieces to find out 'how they are made.' This tells us much, but probably rather less than half the story. Today, scientists are more and more aware that what things are, and what they are doing, depends on where and when they are doing it. If, then, the definition of a thing or event must include definition of its environment, we realize that any given thing goes with a given environment so intimately and inseparably that it is more and more difficult to draw a clear boundary between the thing and its surroundings.

• meaning
• body
• will
• change
• behavior
• environment
• analysis
• definition