10. _What is a Sentence?_
An assemblage of words conveying a thought.

11. _What is a Word?_
A sign of an idea.

12. _What is Lexicology?_
That science which treats of the meaning of words.

13. _What is Etymology?_
That science which treats of the origin and derivation of words.

14. _What is Orthogeny?_
That science which treats of the classification of words into
parts of speech.

15. _What is Syntax?_
That science which treats of the relation and connection of words
in the construction of a sentence.

16. _What is Prosody?_
That science which treats of punctuation and the laws of
versification.

17. _Of what is a word composed?_
A syllable or combination of syllables.

18. _What is a Syllable?_
A letter or letters uttered by a single impulse of the voice.