Harlan F. Stone,
Roche v. Evaporated Milk Association…
“ Considerations of importance to our answer here are that the trial court, in striking the pleas in abatement, acted within its jurisdiction as a district court; that no action or omission on its part has thwarted or tends to thwart appellate review of the ruling; and that while a function of mandamus in aid of appellate jurisdiction is to remove obstacles to appeal, it may not appropriately be used merely as a substitute for the appeal procedure prescribed by the statute. ”
