98 



S. H. Warren — Age of Stone Implements. 



and time can be shown to have resemblances, more or less, with 

 those of other places and other times. It is clear, however, that 

 certain series of implements, found in certain beds, and possessing 

 certain characters, are older or newer than other series of imple- 

 ments possessing different characters. But the fact that even the 

 most highly specialized types are seldom absolutely confined to 

 one epoch, shows that great caution must be exercised in drawing 

 conclusions in the inverse order. 



For convenience of reference I give the following modification of 

 M. de Mortillet's scheme of classification, which, it seems to me, 

 best expresses the relationships of the various epochs, and which 

 I shall use in the course of this paper. 



TABLE OF THE DIVISIONS OF THE PREHISTOEIC AGE. 



