M \ I ERIAL CULTURE. 



33 



Those tribes, however, formerly used the don MS ;l 

 pack animal. 



The use of a sled on the ice or snow has not been 



Fig. 7. Crossing the Missouri in a Bull-Boat. 

 'Wilson photo.) 



credited to any except some of the Santee-Dakota 

 and the Mandan and among them it is quite probable 

 that it was introduced by white traders. 



