1. As a matter of generalization it can be stated that the environment as remembered by the oldest informant or even his parents can scarcely reach into pre-Spanish times. Hence the village populations and distributions as reported in good faith to Gifford or Merriam must have been subjected in some measure to the disruptive effect of the white man. The great disturbance in the valley itself, which was manifested by the entire extinction of whole Yokuts and Plains Miwok tribes, must have had repercussions in the near-by hills through disease, kidnaping, and minor dislocation of food supply, even though the actual territory of the natives was not physically invaded by the newcomers. Hence, a priori, one might anticipate that the populations as derived from ethnographic sources would be somewhat less than truly aboriginal. 2. In the discussion of Gifford's data on the North Fork Mono it was shown, on the basis of persons per family and houses per village, that the population in the memory time of the informants was about 440 whereas the precontact value must have been nearer 640. The population residue in 1840-1850 would then have been 68.8 per cent of the aboriginal level. 3. For the upper Tuolumne and Stanislaus Gifford's population figures were based upon the values given by his informants for 49 villages. The average was 20.8 persons per village, a number which was accepted as valid for the period of 1850. The distribution of population for the villages is as follows: Inhabitants Number of Number of per Village Villages Persons ___________ _________ _________ 60 1 60 55 1 55 35 3 105 30 6 180 25 8 200 20 9 180 15 6 90 10 12 120 5 1 5 0 2 0 ____ ____ ____ Total 49 995 Now it may be assumed that under normal conditions few if any villages would contain less than 20 persons and that those listed by Gifford with 15 or less were the victims of a general decline in numbers. Hence to the latter may be ascribed a minimum of 20 persons. At the same time the other villages must have suffered some reduction. Although there is no positive evidence bearing on the matter, it would not be excessive to add five persons to each of the others. Making these corrections the total becomes 1,340 instead of 995. The residue in 1850 would then be 74.2 per cent of the aboriginal level. Incidentally, the inhabitants per village would then be only 27.35, a value by no means excessive for prehistoric times.