Ebbinghaus, On Memory, 1885, translated by Ruger and Bussenius, 1918. This is the pioneer experimental study of memory, and is still worth reading, and is not specially hard reading.

James's chapter on Memory, in Vol. I of his Principles of Psychology, 1890, is still one of the best references, and contains some important remarks on the improvement of memory.

Of the numerous special studies on memory, mention may be made of that by Arthur I. Gates, Recitation as a Factor in Memorizing, 1917, which, on pp. 65-104, gives a valuable account of the various devices used by one who is memorizing.

For the psychology of testimony, see G. M. Whipple's article on "The Obtaining of Information: Psychology of Observation and Report", in the Psychological Bulletin for 1918, Vol. 15, pp. 217-248, especially pp. 233-248. See also a popularly written account of the matter by MÜnsterberg, in On the Witness Stand, 1908, pp. 15-69.

{366}

CHAPTER XV
ASSOCIATION AND MENTAL IMAGERY