“ When Congress came to make a difference between full-blood and mixed-blood Indians, by subjecting the former to restrictions not applied to the latter, it evidently deemed it better for the Indians and all concerned that there be some fixed, easily accessible and reasonably reliable evidential standard by which to determine, for the purpose of the matter then in hand, who were of the full-blood and who of the mixed-blood. ”

“ The act of April 26, 1906, supra, besides making the presence or absence of restrictions on the alienation of allotments dependent on the quantum of Indian blood possessed by the allottee or heir, declared that 'the quantum of Indian blood possessed by any member of said tribes shall be determined by the rolls of citizens of said tribes approved by the Secretary of the Interior.' Act June 21, 1906, c. ”

“ The lands formerly belonged to the Creek Tribe and were allotted and patented to Kochokney, an enrolled member of that tribe, as his part or share of the tribal domain. He died, and Yekcha, as sole heir, succeeded to the title. ”