THE PERCEPTION OF THINGS. 133 



several highly distinguished men in science and literature, most of 

 whom I found to be slow readers. " * 



* Literature. The best treatment of perception with which I am ac- 

 quainted is that in Mr. James Sully's book on ' Illusions ' in the Interna- 

 tional Scientific Series. On hallucinations the literature is large. Gurney, 

 Kandinsky (as already cited), and some articles by Kraepelin in the 

 Vierteljahischrift ftlr Wissenschaftliche Philosophic, vol. v (1881), are 

 the most systematic studies recently made. All works on Insanity treat 

 of them. Dr. W. W. Ireland's works, ' The Blot upon the Brain ' (1886) and 

 ' Through the Ivory Gate ' (1890) have much information on the subject. 

 Gurney gives pretty complete references to older literature. The most 

 important thing on the subject from the point of view of theory is the 

 article by Mr. Myers on the Demon of Socrates in the Proceedings of the 

 Society for Psychical Research for 1889, p. 523. 



