Its final section dismisses the efficacy of a particular counterargument based on the notion that man, at times, knows not whether he is asleep or awake, by noting that one's memory never joins dreams to the other actions of life.  
This work's Preface claims inspiration from Apollonius and Pappus' geometry in its method of exigesis.  Its final section dismisses the efficacy of a particular counterargument based on the notion that man, at times, knows not whether he is asleep or awake, by noting that one's memory never joins dreams to the other actions of life.  That discussion is preceded by the author's argument for "extension" as an essential property, which cites the example of a ball of wax that melts and changes shape but remains the same substance.  Dedicated to "the deans and doctors of the faculty of sacred theology in Paris," its fourth section argues all that we perceive is true, while the fifth section offers a "new proof" for the existence of God.  For 10 points, identify this essay which responded to the queries prompted by its author's previous piece, Discourse on Method, a work by Rene Descartes.
This work's Preface claims inspiration from Apollonius and Pappus' geometry in its method of exigesis.  
Meditations on First Philosophy