“ By the clearest implication those laws show that it was not intended that naturalization could be secured thereunder by an alien whose purpose was to escape the duties of his native allegiance without taking upon himself those of citizenship here, or by one whose purpose was to reside permanently in a foreign country, and to use his naturalization as a shield against the imposition of duties there, while by his absence he was avoiding his duties here. Naturalization secured with such a purpose was wanting in one of its most essential elements,-good faith on the part of the applicant. ”

“ It will be observed that this provision prescribes a rule of evidence, not of substantive right. It goes no farther than to establish a rebuttable presumption which the possessor of the certificate is free to overcome. If, in truth, it was his intention at the time of his application to reside permanently in the United States, and his subsequent residence in a foreign country was prompted by considerations which were consistent with that intention, he is at liberty to show it. ”

“ It does not make any act fraudulent or illegal that was honest and legal when done, imposes no penalties, and at most provides for the annulment, by appropriate judicial proceedings, of merely colorable letters of citizenship, to which their possessors never were lawfully entitled. ”