in issue and relevant facts.— Evidence may be given in any suit or proceeding of the existence or non-existence of every fact in issue and of such other facts as are hereinafter declared to be relevant, and of others.

Explanation. — This Article shall not enable any person to give evidence of a fact which he is disentitled to prove by any provision of the law for the time being in force relating to Civil Procedure. Illustrations
  (a) A is tried for the murder of B by beating him with a club with the intention of causing his death. At A’s trial the following facts are in issue — A’s beating B with the club; A’s causing B’s death by such beating; A’s intention to cause B’s death.
  (b) A suitor does not bring with him and have in readiness for production at the first hearing of the case, a bond on which he relies. This Article does not enable him to produce the bond or prove its contents at a subsequent stage of the proceedings, otherwise than in accordance with the conditions prescribed by the law for the time being in force relating to Civil Procedure.