McKeag, Edwin C. Mistake in Contract: A Study in Comparative Jurisprudence. New York: Columbia University Press, 1905. 132 pp. Reprinted 2003 by The Lawbook Exchange, Ltd. LCCN 2002072856. ISBN 1-58477-276-X. Cloth. $60. * In contract law there are two types of mistake as determined by Savigny. The first, echt, represents those cases in which consent exists, but the contract is impeachable due to the determination of mistake. This work examines the second class of mistake in contract, unecht, "...in which real consent is lacking, resulting in the nullity of the contract, while the mistake is an accompanying feature" (Preface). This class of mistake is traced from Roman law to common law and modern civil law. Originally published as Volume XXIII, Number 2 in Columbia's series, Studies in History, Economics and Public Law.