_ Give logical definitions for at least four words in the list below.
1. Telephone.
2. Square.
3. Hammer.
4. Novel
5. Curiosity.
6. Door.
7. Camera.
8. Brick.
9. Microscope.
+161. Inexact Definitions.+--If the distinguishing characteristics are not
properly selected, the definition though logical in form may be inexact,
because the differentia do not exclude all but the term to be defined. If
we say, "Exposition is that form of discourse which gives information,"
the definition is inexact because there are other forms of discourse that
give information. Many definitions given in text-books are inexact. Care
should be taken to distinguish them from those which are logically exact.
EXERCISE
Which of the following are exact?
1. A sheep is a gregarious animal that produces wool.
2. A squash is a garden plant much liked by striped bugs.
3. A pronoun is a word used for a noun.
4. The diaphragm is a sheet of muscle and tendon, convex on its upper
side, and attached by bands of striped muscle to the lower ribs at the
side, to the sternum, and to the cartilage of the ribs which join it in
front, and at the back by very strong bands to the lumbar vertebrae.
5. A man is a two-legged animal without feathers.
6. Argument is that form of discourse which has for its object the proof
of the truth or falsity of a proposition.
7. The base of an isosceles triangle is that side which is equal to no
other.
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