“ True, the board's proceedings and adjudication are referred to as having some bearing upon the good faith of the Canal Company, and upon the knowledge which the other parties had of that company's claim, but in this the court neither departs from the assumption indulged nor confuses the two grounds of the judgment. Even if invalid, the board's proceedings and adjudication could well have a real bearing upon the matters indicated. ”

“ It does not, as we think, admit of doubt that the estoppel in pais is made an independent ground of the judgment. Instead of being interwoven with the validity of the state board's adjudication, which is the other ground, it is distinct from it, and is so treated in the court's opinion. In taking up the question of estoppel as also in concluding its discussion of the subject, the court plainly shows that it is then indulging an assumption that the other ground is not tenable. ”

“ But where the non-Federal ground is so interwoven with the other as not to be an independent matter, or is not of sufficient breadth to sustain the judgment without any decision of the other, our jurisdiction is plain. ”