Treaties — Interpretation of — Statement of Executive on conditions governing exercise of right of alien to engage in trade guaranteed by treaty — Whether statement binding on courts — The law of France.

Aliens — Position of — Treatment by receiving State — Right of alien to engage in trade guaranteed by treaty — Distinction between granting a right and regulating conditions of exercise of right — Whether trader's permit required — Franco-Italian Agreement of May 17, 1946 — Statement of Executive on requirement of permit — Whether statement binding on courts — The law of France.