26Local authority to do works on owner's or occupier's default, or if person causing nuisance cannot be found.
In case of non-compliance with or infringement of any decree aforesaid, the sheriff, magistrate, or justice may, on application by the local authority, grant' warrant to such person or persons as he may deem right to enter the premises to which such decree relates, and remove or remedy the nuisance thereby condemned or interdicted, and do whatever may be necessary in execution of such decree; or if in the original application it appears to his satisfaction that the author of the nuisance is not known or cannot be found, then such decree may at once ordain the local authority to execute the works thereby directed ; and all "expenses incurred by the local authority in executing the works may be recovered from the author of the nuisance and failing him from the owner of the premises.