a 
consider the improbability of extended continental occupation# 
much l&m of world occupation by a primitive race doubtless not yet 
master of a wide range of cmviroartental conditions# and we are 
fully Justified in requiring that proofs of m&h world occupation of 
the highest order bo furnislied* I-eager and uncertain traces of 
American occupation of the early Periods as compared with those of 
the old world _ warrant the closest scrutiny of over/' alleged proof* 
■ V 
Insistence of. His requirement is justified by the facts; first, 
that up to the present tine ire have no absolute assurance that 
- 
the two continents were, in the early human periods, so intimately 
connected that primitive peoples could pass fron the one to the 
other* second, th.it the earlier- work in this field of research has 
\ 
been largely by students not well qualified to consider the geol¬ 
ogical problems 1 swelled* in Ilirope, prolonged research has 
shown that there are certain types of artifacts associated with 
particular formations and periods* i;o such result has been reached 
in It. erica, md the assignment of any object of human workmanship 
to a period earlier than the recent must depend solely on its re- 
