It is but rare indeed that any country or age produces a Demosthenes, a Pitt, a Thomson, or a Brougham; and such persons have hitherto been considered as gifts of Nature, rather than the legitimate production of educational exercises. But this we conceive to be a mistake. They may perhaps have been self-taught, and self-exercised, as Demosthenes confessedly was; but that teaching, and especially mental and oral exercise, are necessary for the production of one of Nature's chief ornaments, both analogy and experience abundantly shew.[8] Fluency in the use of words is not enough,--copiousness of thought, such as may be of use in the study, is not enough;--for Nature's work, of which we are at present speaking, consists chiefly in the faculty of forming one train of thoughts in the mind, at the same time that the individual is giving expression to another. Every child, accordingly, who holds conversation with his companion, is practising on a limited scale the very exercise which, if carried out by regular gradations, would ultimately lead to that excellence which we have above described. In every case of free unconstrained conversation, the operation of this principle of Nature is apparent; for the idea is present to the mind some time before the tongue gives it utterance, and the person is preparing a second idea, at the moment he is communicating the first. Upon this simple principle the whole art of eloquence, when analyzed, appears to depend. We shall therefore endeavour to trace its operation, and the methods which Nature adopts for the purpose of perfecting it.