For the three remaining northern Athapascan tribes we possess very little data of a strictly ethnographic character. Neither Kroeber nor Nomland (1935, 1938), who has studied some of these groups, have been able to secure any pertinent information regarding villages. Nor has Merriam been more successful. His list covering the region, under the title "Athapaskan Tribes, Bands and Villages Speaking the Nungkahl Language," mentions not more than two dozen villages in all and these are very widely scattered. The entire failure of competent investigators such as those mentioned to come upon material traces of inhabited sites among these three tribes might be taken as indicative of a very small population. However, the existence of heavily inhabited areas to all sides of the region held by these tribes makes it unlikely that there was any large stretch of country which was devoid of a sizable Indian population. It is much more probable that numerous villages of the Lassik, Nongatl, and Sinkyone once did exist but that they were wiped out almost completely by the white frontiersmen in the early 'fifties before any observer left a record of them. As an indication of their fate may be mentioned the tales told by Bledsoe (1885) in his "Indian Wars of the Northwest" and by various witnesses in the Report to the California Legislature (1860) on the "Mendocino War." When we are presented with such an entire lack of direct data, we are quite justified in falling back on the indirect area-density method. Thus the densities are tabulated below for the five other Athapascan tribes (including the Wailaki, considered subsequently) and for the Coast Yuki, a tribe in the region for which we have very accurate counts. Approximate Density in area in persons per Tribe sq. mi. Population sq. mi. Chilula 210 800 3.86 Mattole 210 1,200 5.72 Whilkut 250 1,320 5.28 Kato 270 1,100 4.07 Wailaki 575 3,347 5.82 Coast Yuki 150 756 5.04 ---- Mean 4.96 The close correspondence in density of the six tribes listed is noteworthy, and tends to lend confidence in the reliability of the ethnographic source material upon which these estimates are based.