The court may exercise a reasonable control over the mode of interrogation, so as to make it as rapid, as distinct, as little annoying to the witness, and as effective for the extraction of the truth as may be; but, subject to this rule, the parties may put such legal and pertinent questions as they see fit. The court, however, may stop the production of further evidence, upon any particular point, when the evidence upon it is already so full as to preclude reasonable doubt.