concealing irom the American represratative, then resilient at this court and this capir:u, ah knowledge of the pendency vi negotiations, vitally affecting the interests aad policy ..f his Government, thereby depriving him ol the ight and privilege oi defending ihose rights and maintaining that policy, as violative of the established courtesies which belong to and exist ladipl iinauc interc onse, and 111 di-re rtrd of 'h>-claims of the Uuiied Bates to the