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This volume presents a survey of the various methods which have been employed in ancient and modern times to detect deception, together with a description of the technic which the author has developed. His "lie detector" is a cardiopneumographic record of the suspected person, taken while the latter is answering a series of direct questions the implications of which he must either affirm or deny. The graphs are obtained by a specially devised sphygmomanometer.
The first section of the book deals with the definition of lying and the types of lying, and the second, with the methods that have been used to determine guilt or innocence from early times to the present. The difficulties involved in all these, from the methods of torture to the modern judge and jury system, are shown by quotations from criminologists and other investigators and by reports of illustrative cases. In the third section the