“ At best the paragraph does no more than present abstract questions respecting the right of the plaintiff state and her citizens to use the waters for such purposes in the indefinite future. We are not at liberty to consider abstract questions. ”

“ The suit is one for an injunction, a form or relief which must rest on an actual or presently threatened interference with the rights of another. Plainly no basis for such relief is disclosed in what is said about water power development. ”