+Explanation+.--_A cotton and a silk umbrella_ means two umbrellas--one
cotton and the other silk; the word umbrella is understood after _cotton_.
_A cotton and silk umbrella_ means one umbrella partly cotton and partly
silk; _cotton_ and _silk_ modify the same noun--_umbrella_. _The wise and
the good_ means two classes; _the wise and good_ means one class.
+Direction+.--_Study the Caution as explained, and correct these errors_:--
1. The Northern and Southern Hemisphere.
2. The Northern and the Southern Hemispheres.
3. The right and left hand.
4. A Pullman and Wagner sleeping-coach.
5. The fourth and the fifth verses.
6. The fourth and fifth verse.
7. A Webster's and Worcester's dictionary.
+Caution+.--Use _an_, _a_, or _the_ before each of two or more connected
nouns denoting things that are to be distinguished from each other or
emphasized.
+Direction+.--_Study the Caution, and correct these errors_:--
1. There is a difference between the sin and sinner.
2. We criticise not the dress but address of the speaker.
3. A noun and pronoun are alike in office.
4. Distinguish carefully between an adjective and adverb.
5. The lion, as well as tiger, belongs to the cat tribe.
6. Neither the North Pole nor South Pole has yet been reached.
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