In the absence of proof that the contract containing the arbitration clause was subscribed by the person against whom it is intended to invoke that clause, in the face of timely disavowal of the signature pursuant to Article 214 of the Code of Civil Procedure, the objection of arbitration must be judged unfounded. The attributive effect of cognizance to arbitrators presupposes the ascertainment of the authenticity of the signature affixed upon the contractual document containing the arbitration agreement.