What Is in My Mind?

In order to understand Barkley's argument, it is necessary to understand his use of the word idea. He gives the name idea to anything which is immediately known, as for example, sense data are known. All such immediate data he calls ideas. Then proceeds to consider common objects, such as a tree for instance. He shows that all we know immediately when we perceive the tree consists of ideas in his sense of the word. There are in this argument a good many fallacies which have been important in the history of philosophy and which it will be as well to bring to light.