Jemmy Johnson is the Great High Priest of the confederacy. Though now 69 years old, he is yet an erect, fine looking, and energetic Indian, and is both hospitable and intelligent. He is in possession of the medal presented by Washington to Red Jacket in 1792, which, among other things of interest, he showed us. It would be incompatible with the present purpose to describe all the interesting men who there assembled, among whom were Capt. Frost, Messrs. Le Fort, Hill, John Jacket, Dr. Wilson and others. We spent most of Tuesday, and indeed much of the time during the other days of the week in conversation with the chiefs and most intelligent Indians of the different nations, and gleaned from them much information of the highest interest in relation to the organization, government and laws, religion, customs of the people, and characteristics of the great men, of the old and once powerful confederacy. It is a singular fact, that the peculiar government and national characteristics of the Iroquois is a most interesting field for research and inquiry, which has never been very thoroughly, if at all, investigated, although the historic events which marked the proud career of the confederacy, have been perseveringly sought and treasured up in the writings of Stone, Schoolcraft, Hosmer, Yates and others. Many of the Indians speak English readily; but with the aid and interpretations of Mr. Ely S. Parker, a young Seneca of no ordinary degree of attainment, in both scholarship and general intelligence, and who, with Le Fort, the Onondaga, is well versed in old Iroquois matters, we had no difficulty in conversing with any and all we chose to. About mid-day on Wednesday, the council commenced. The ceremonies with which it was opened and conducted were certainly unique—almost indescribable; and as its proceedings were in the Seneca tongue, they were in a great measure unintelligible, and in fact profoundly mysterious to the pale faces. One of the chief objects for which the council had been convoked, as has been heretofore editorially stated in the American, was to fill two vacancies in the sachemships of the Senecas, which had been made by the death of the former incumbents; and preceding the installation of the candidates for the succession, there was a general and dolorous lament for the deceased sachems, the utterance of which, together with the repetition of the laws of the confederacy—the installation of the new sachems—the impeachment and deposition of three unfaithful sachems—the elevation of others in their stead, and the performance of the various ceremonies attendant upon these proceedings, consumed the principal part of the afternoon.