The case of those concepts is that of all other psychological constructions: no rigorous definitions of them are possible; and consequently they cannot be deduced from one another nor be connected in a system, though this has often been attempted, with great waste of time and without obtaining thereby any useful results. Nor can it be claimed as possible to obtain empirical definitions, universally acceptable as precise and true in the place of those philosophical definitions recognized as impossible. For no single definition of a single fact can be given, but there are innumerable definitions of it, according to the cases and the purposes for which they are made; and it is clear that if there were only one which had the value of truth it would no longer be an empirical, but a rigorous and philosophical definition. And as a matter of fact whenever one of the terms to which we have referred has been employed (or indeed any other belonging to the same class), a new definition of it has been given at the same time, expressed or understood. Each one of those definitions differed somehow from the others, in some particular, however minute, and in its implied reference to some individual fact or other, which thus became a special object of attention and was raised to the position of a general type. Thus it is that not one of such definitions satisfies either the hearer or the constructor of it. For a moment later he finds himself before a new instance to which he recognizes that his definition is more or less insufficient, ill-adapted, and in need of retouching. So we must leave writers and speakers free to define the sublime or the comic, the tragic or the humorous, on every occasion as they please and as may suit the end they have in view. And if an empirical definition of universal validity be demanded, we can but submit this one:--The sublime (or comic, tragic, humorous, etc.) is _everything_ that is or shall be so _called_ by those who have employed or shall employ these _words._ [Sidenote: _Examples: definitions of the sublime, the comic, the humorous._]