For the Athapascan and Yukian peoples, as well as for the Northern Pomo, a marked correspondence could be observed between the two sets of data, even though entire identity could not be achieved. For the Central Pomo, on the other hand, there is a striking disparity: the Heintzelman estimate reaches only one-third the value obtained from ethnographic sources. Since Heintzelman could reach his maximum accuracy among the relatively well known Central Pomo, as opposed to the remoter northern groups, we cannot ascribe his low count to ignorance or carelessness on his part. The most reasonable explanation is that the Central Pomo had already by 1855 suffered a reduction in population of from one-half to two-thirds of the aboriginal level. Such an hypothesis is entirely consistent with all we know of Mexican and American settlement in Sonoma and southern Mendocino counties and, furthermore, tends to lend support to the much higher figures reported by Heintzelman for the more northerly tribes. _Central Pomo ... 6,220_ SOUTHWESTERN POMO This group, consisting principally of the Kacia of Stewart's Point, has already been discussed under the Central Pomo. SOUTHERN POMO In this area lived five large groups, named variously by different students, centering around Dry Creek, Cloverdale, Healdsburg, Santa Rosa, and Sebastopol. The Pomo residue, mentioned by Barrett, and others who survived in Alexander Valley are here omitted since they may be more appropriately considered as contributing to the predominantly Wappo population. Likewise, the village of Wilok, east of Santa Rosa, is probably considered more satisfactorily in conjunction with the neighboring Wappo. Modern ethnographic data are of little value for estimating the population of the Southern Pomo, however carefully it may have been secured. The Spanish and Mexican missionaries, accompanied by the military, entered the area certainly before 1820 and by the year 1835 the Southern Pomo had been relocated in the missions, conscripted for labor, or carried off by disease. Shortly after 1840 the Americans began to appear and as a result the original village pattern was completely disrupted. Hence it is relatively useless to compute population from the sites which in recent years have been remembered by Indian or white informants. Merriam, following Barrett, lists about 80 village names but in very few instances endorses Barrett's findings by subscribing his initials. To attempt any detailed analysis of these sites would serve no useful purpose whatever.