This work criticizes the equation of "real existence" with "mind-independent existence" and argues for the existence of our ideas in the mind of an infinite perceiver called God and builds on the theory set forth in the author's earlier Treatise Concerning the Principles of Human Knowledge that reality is determined by our own perception.   
In one section, this work questions the idea behind the concept of being "spread" and asks whether an object can be spread without being extended as part of an argument against the theory of a "substratum".  In another section, an example involving an insect's foot is used to criticize the distinction between primary and secondary qualities of objects, and that section concludes with the affirmation of materialism's inevitable degeneration into skepticism.  This work criticizes the equation of "real existence" with "mind-independent existence" and argues for the existence of our ideas in the mind of an infinite perceiver called God and builds on the theory set forth in the author's earlier Treatise Concerning the Principles of Human Knowledge that reality is determined by our own perception.   FTP, name this work consisting of philosophical debates between characters representing John Locke and the author, George Berkeley.
In one section, this work questions the idea behind the concept of being "spread" and asks whether an object can be spread without being extended as part of an argument against the theory of a "substratum".  
{Three Dialogues} Between {Hylas} and {Philonous}