PER CURIAM.

This case came on for consideration on petitioners’ motion for leave to file a petition for writ of certiorari and on the petition for writ of certiorari and said motion and petition were argued by counsel.

It appearing that the petition for writ of certiorari has been lodged with the clerk, it is

Ordered by the court that the petition for writ of certiorari shall be filed.

In response to a previous petition of the same nature by the same petitioners, this court, on August 8, 1958, entered an order which, as clarified by an order entered on December 16, 1958, provided that the issue which petitioners seek to refer to the commission for initial consideration was required to be referred only if found by the District Court, in the exercise of a discretion based upon its knowledge of the case, to be the “sole or dominant” issue in the case. In its opinion of January 16, 1959, supporting its order of January 26, 1959, the District Court concluded, inter alia, that the issue in question “is in no sense the dominant, much less the sole, issue of this litigation.”

Our extraordinary jurisdiction under 28 U.S.C. § 1651 (1952) to review by common-law writs the interlocutory orders of the District Court should be exercised only in very limited and unusual circumstances. We have examined carefully the contentions made by petitioners and have concluded that, in the circumstances of this case, it would not be in the best interests of sound judicial administration to review at this stage of the litigation the District Court’s decision either by writ of certiorari or by the alternatively requested amendment or clarification of our orders of August 8, 1958, and December 16, 1958.

Therefore, it is Ordered by the court that the petition for writ of certiorari, or in the alternative, the motion for clarification of our orders of August 8, 1958, and December 16, 1958, is hereby denied.