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5 Notre Dame Law. 303 (1929-1930)
Parol Evidence Rule

handle is hein.journals/tndl5 and id is 306 raw text is: Parol Evidence Rule
By JosEPH UnQuico
The term parol is of French origin. Its literal mean-
ing is word, or speech. In this sense it is synonymous with
the term oral. In practice, however, it also has a conven-
tional meaning. As applied to contracts it means not under
seal. In other words a parol contract is a simple contract,
as distinguished from a contract under seal. It may be in
writing, or merely oral. If a contract under seal be subse-
quently modified by oral agreement of the parties it will
become thereby wholly parol. This has been decided in
Mifunroe v. Perkins, 26 Mass. 298.
The term parol as used in the law of pleadings, has
also a conventional meaning. The pleadings themselves are
called the parol; and in some cases the term is used to de-
note the entire pleading in the cause.
In the law of evidence, the term is also used in conven-
tional sense. As used in the phrase Parol Evidence Rule
it is synonymous with term verbal as. distinguished from
the term oral. These two terms, however, are often in-
correctly used and interchangeably.
The Parol Evidence Rule, is one of the most ancient
rules of evidence of wide application which rests upon the
principle that no testimony can be received to contradict,
vary, add to, or subtract from the terms of a valid written
instrument. The two chief reasons for the rule are: (1) The
uncertainty of memory, and (2) The danger of falsehood.
The rule is also founded on the long experience, that written
evidence is so much more certain and accurate than that
which rests in fleeting memory only, that it would be un.-
safe, when parties have expressed the terms of their con-
tract in writing, to admit weaker evidence to control and
vary the stronger, and to show that the parties intended a
different contract from that expressed in the writing signed
by them. Justice Sewall says, The preference which the
law gives to written evidence, when compared with parol
testimony, of parol agreements, is the unavoidable result
of experience. It is impossible to attain that certainty and
exactness in the one form of evidence, which is found in

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