The alphabetical arrangement lets a reader enter through a single question rather than follow a continuous philosophical system. An animal's behavior, a fashionable judgment or a dispute about freedom can become an occasion to examine how a belief was acquired and what evidence would support it.
Voltaire often puts an argument into a conversation. A confident definition meets an awkward example, and the speaker must explain what the words would mean in practice. The comedy can make a distinction memorable without making every historical or scientific assertion reliable.
The 1764 book should be distinguished from Questions sur l'Encyclopédie, issued in the 1770s. Later editors combined alphabetical writings from several sources. The six readings below follow H. I. Woolf's 1924 English selection, whose versions and extent should not be assumed identical to the first portable dictionary or to Theodore Besterman's selected translation.