Contract for the provision of medical and hospital services with an arbitration clause. Hospital that protests a negotiable instrument without submitting the matter to arbitration. Failure to invoke the objection based on an arbitration agreement precludes dismissal of the case without adjudication on the merits. On the merits, the court upheld the unenforceability of the instrument and the impossibility of protest due to the absence of a determination of the amount in arbitration proceedings: