What was, now, the population aboriginally? The mission baptisms are of no use to us since the Indians in 1843 included most of the ex-neophytes in the area. That there had already been a profound reduction at that time is unquestioned. The north shore of the Bay had been subject to military, clerical, and civilian incursion since the beginning of the century. Lethal epidemics had swept over the country repeatedly. Massacre and slaughter had been the rule rather than the exception. Indeed, the open valley through Sonoma and Napa up to Calistoga had suffered more seriously than any other area except perhaps the delta of the Sacramento River. A population reduction from the aboriginal level by one-third prior to 1843 would not be out of line with the apparent facts. The estimates for the period 1840-1845 derived from Yount, Hittell, and Menefee included the Central Wappo with the more southern groups. For the Central Wappo the ethnographic sources and the mission records indicated an aboriginal population of 450 or 500. However, it is probably advisable to disregard this small division as a separate entity and include it with the remaining Wappo and the Suscol Wintun. If we then take Yount's minimum estimate of 3,000 for the Napa Valley south of Mt. St. Helena and if we assume a one-third decrease in numbers from aboriginal times to 1843, the final estimate for the area becomes 4,500. The figure just derived is of course considerably greater than would be indicated by either the ethnographic village lists or the mission baptism records, but it must be conceded that the two last methods of approach are inadequate for the situation existing in the Napa Valley. On the other hand for a population of 4,500 and an area of 600 square miles, the density would be 7.5 persons per square mile, or very close to the value arrived at for the near-by Pomo. We have found by ethnographic derivation 1,680 persons for the Western Wappo and 1,800 for the Northern Wappo and Lake Miwok together. Thus the total for the Lake Miwok, the Wappo, and the Suscol Wintun as a whole becomes approximately 8,000. _WAPPO, LAKE MIWOK, AND NAPA VALLEY WINTUN ... 8,000_ SUMMARY OF ESTIMATES For convenience of reference the population estimates presented in the foregoing text are tabulated as follows: