3. Evidence where several issues.

Where there are several issues, the burden of proving some of which lies on the party, the party beginning may, at his option, either produce his evidence on those issues or reserve it by way of answer to the evidence produced by the other party; and, in the latter case, the party beginning may produce evidence on those issues after the other party has produced all his evidence, and the other party may then reply specially on the evidence so produced by the party beginning; but the party beginning will then be entitled to reply generally on the whole case.