Criticize the following in terms of the rules for definition by genus and difference. After identifying the difficulty (or difficulties), state the rule (or rules) that are being violated. If the definition is either too narrow or too broad, explain why.

To explain (explicate, explicare ) is to strip reality of the appearances covering it like a veil, in order to see the bare reality itself.

—Pierre Duhem, The Aim and Structure of Physical Theory , 1991