As a general rule. the admission by the arbitrators, at the hearing of evidence which would have been inadmissible in an action at law or a suit in equity as immaterial or incompetent, does not of itself render the award invalid if it appears from the entire proceedings that the arbitrators decided the issue which was submitted to them by the parties.1 As a general rule, on the other hand, the exclusion of admissible, material, and non-cumulative evidence, while it apparently did not affect the award at law, justifies a court of equity in setting the award aside and in preventing its enforcement.2 This rule applies, however, only when the evidence which is excluded is material.3