*777 Order affirmed without costs, on the ground that the denial of a mandamus order to challenge the validity of the promotion of employees who are not parties to the proceeding was under all the circumstances disclosed in the record a proper exercise of discretion. We decide no other question. No opinion.

Concur: Lehman, Ch. J., Loughran, Rippey, Lewis, Conway and Desmond, JJ. Taking no part: Finch, J.