Aristotle 
Organon, or Logical Treatises, of Aristotle [PDF ebook] 
With the Introduction of Porphyry

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Wvherefore, while primarily connected with the laws of Thought, Logic is secondarily and practically allied to language as enunciative of Thought. To enter into the mental processes incident thereto, though so tempt ing a theme as already to have seduced many from the direct subject of the science, would far exceed the limits of this Introduction. We shall therefore content ourselves with a few observations upon the utility of the study connected with the Organon itself.