226 FOSSIL MEN. 



as might obtain among a huntiag and migratory 

 people, and the animals on which they relied for sup- 

 port, at different seasons or in the lapse of a few 

 generations differences much less than those which 

 we know were occurring in almost every generation 

 among the Indian tribes of America before the advent 

 of Europeans. Such conditions would vary among 

 the primitive people of the Yezere valley according to 

 the " success of the hunters or the sojourn of migratory 

 animals in the neighbourhood/' and even more accord- 

 ing to the relations of peace or war, victory or defeat, 

 which they might sustain with neighbouring tribes. 



To one of these caves of habitation and sepulchre, 

 that of Cro-magnon, I have fully referred in the last 

 chapter, and may now add a few remarks as to the 

 lapse of time during which it may have been occupied. 

 Such shelters, though now open in front, were prob- 

 ably, when inhabited, walled up on the outer side with 

 logs, wattle, or boughs of trees ; and it is most likely 

 that they were the winter houses of the people. 



The accumulation of ashes, bones, and other remains 

 is in exact accordance with the - want of cleanliness of 

 the ruder American tribes, and also with the habits 

 of a people who in summer live in the open air, or in 

 temporary cabins or wigwams, and only in the colder 

 months or in bad weather resort to more secure and 

 permanent abodes. The accumulation of rubbish in 

 such places, and especially at their mouths, is also a 

 much more rapid process than would at first sight be 

 supposed, more particularly as the remains of fir 



