“ Co. v. Swan, 13 C. C. A. 77, 31 U.S. App. 112, 65 Fed. 647, applicable to 'initial questions of the jurisdiction of a United States district or circuit court, whether in law or equity, over the subject-matter and parties, and not to questions whether a court of equity or of law is the proper forum for the working out of rights properly within the particular Federal jurisdiction for adjudication;' and it has long been settled that it is the jurisdiction of the United States courts as such which is referred to. ”

“ Rep. 570; Interior Constr. & Improv. Co. v. Gibney, 160 U.S. 217, 40 L. ed. 401, 16 Sup. Ct. Rep. 272; Smithers v. Smith, 204 U.S. 632, 51 L. ed. 656, 27 Sup. Ct. Rep. 297; Petri v. F. E. Creelman Lumber Co. ”