This section is from the book "Popular Law Library Vol7 Equity Jurisprudence, Trusts, Equity Pleading", by Albert H. Putney. Also available from Amazon: Popular Law-Dictionary.
Pleas in bar are classified as follows:
(1) Pleas in bar resting on statute.
(a) The statute of limitations.
(b) The statute of frauds.
(c) Any other statute creating a bar.
(2) Pleas in bar founded on matter of record:
(a) A judgment at law in a court of record.
(b) The judgment or decree of a foreign court.
(c) A decree of a court of equity.
(3) Pleas in bar depending on some matters in pais.
(a) A release.
(b) A stated account.
(c) A settled account.
(d) An award.
(e) That the defendant is a purchaser for a valuable consideration.
(f) Title in the defendant.