This is true also for the so-called Eastern Shoshone. We have shown that these mounted people wintered on the Bear and Green rivers until their final establishment on the Wind River Reservation; in fact, the first Eastern Shoshone Agency was at Fort Bridger. Annual trips were made to Salt Lake City, after its settlement by the Mormons, and visits into Idaho were frequent. Moreover, Shoshone not generally associated with Washakie's leadership who possessed horses joined the latter for buffalo hunting. Evidence for this is most clear in the case of Pocatello's followers. This particular band, found at various times buffalo hunting in central Wyoming, wintering in northern Utah or southeastern Idaho, and fishing or raiding on the Snake River, is an excellent example of the social continuity between Plains and Basin-Plateau. That there was such social continuity, merging, and interpenetration indicates a common set of social understandings, of great similarity in social structure. It may be further argued that this continuity and exchange of population served in some degree to preserve a more amorphous Basin-type society among the buffalo hunters. It is clear that larger political units existed among the mounted Shoshone and Bannock than among their fellows to the east. We believe, however, that it would be erroneous to attribute great stability or cohesiveness to these aggregates, for the seasonal amalgamation and splitting of other Plains populations is even more pronounced among the Shoshone. The reason for this is partly the fact that the Shoshone spent long periods of the year west of the Rockies and within the range itself. Buffalo hunting did unite most of the mounted people every fall and to a lesser extent in the spring. There is considerable variation of evidence on whether the people crossing the Divide from Wyoming and Idaho formed two large parties or several smaller ones. It may be surmised that the large parties were common in earlier times owing to the threat of enemies, but the smaller ones seem to have been more common later in the nineteenth century, especially after the establishment of the Wind River Reservation. The time spent in the buffalo hunt was closely correlated with the distance to the herds. Our fragmentary accounts suggest that in the upper Green and Snake rivers before 1840, smaller groups hunted for shorter periods. The Big Horn Basin, however, is more than 200 miles from the Green River area, and the bands were forced to travel longer distances and to kill their winter meat supply in one prolonged hunt. Although the Wyoming Shoshone usually were able to return for the winter to the Green and Bear rivers, this was not true of those Idaho Shoshone and Bannock who sought buffalo in Montana. The distance from Camas Prairie in Idaho to the buffalo country of Montana was almost 500 miles, making a winter return to Idaho most difficult and aggravating the problem of packing meat.