Rosamond Sprague 
Plato”s Use of Fallacy (RLE: Plato) [PDF ebook] 
A Study of the Euthydemus and some Other Dialogues

There are many fallacious arguments in the dialogues of Plato. The author argues that Plato was fully conscious of the fallacious character of at least an important number of these arguments and that he sometimes made deliberate use of fallacy as an indirect means of setting forth certain of his fundamental philosophical views. Plato introduces them, the author maintains, for the purpose of working out their implications. Plato is thus able to expose them for what they are, to clear away possible lines of attack upon his own position, and even to show that when the proper correction is applied his own views receive support.