Admissions by Parties and Agents encompass authorised statements, representative-capacity statements, and interested persons' statements made during continuing interests.

Section 18 recognises as admissions statements made by a party and by an expressly or impliedly authorised agent. Statements by a party acting in a representative capacity qualify only when made while that character was held. Statements made by persons with proprietary or pecuniary interests in the subject matter, and by persons from whom parties derive their interest, may constitute admissions when made during the continuance of the maker's interest.

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