“ Now, assuming that the term 'matter in dispute' may embrace a right to have a claim against a foreign government presented through the political department of the United States, and that the value of such a right may be gauged by the possible pecuniary injury which may be sustained if no such action is taken, it is yet evident that the claim under consideration is one haveing merely a conjectural value. The 'matter in dispute,' as respects a money demand, has relation to justiciable demands. ”

“ Now, the averments in the petition for mandamus in this case do not, under the priciples of the law of false imprisonment prevailing in this country, state a cause of action even against individuals, much less against a sovereignty ”