256 PICTOGRAPHS OF THE NORTH AMERICAN INDIANS. 



graphical features should be noted, if possible, by an accurate survey, 

 otherwise by numeration and sketching. 



The following details should be carefully noted : The direction of the 

 lace of the rock. The presence of probable trails and gaps which may 

 have been used in shortening distances in travel. Localities of mounds 

 and caves, if any, in the vicinity. Ancient camping grounds, indicated 

 by fragments of pottery, Hint chips, etc. Existence of aboriginal relics, 

 particularly flints which may have been used in pecking; these may be 

 found at the base of the rocks upon which petroglyphs occur. The 

 presence of small mortar-holes which may have served in the prepara- 

 tion of colors. 



With reference to pictographs on other objects than rock the mate- 

 rial upon which they appear and the substances used in their execution 

 should be reported, as indicated in another part of this paper. 



With reference to all kinds of pictographs, it should be noted that 

 mere descriptions without reproduction are of little value. Probable 

 age and origin and traditions relating to them should be ascertained. 

 Their interpretation by natives of the locality who themselves make 

 pictographs or who belong to people who have lately made pictographs 

 is most valuable, especially in reference to such designs as do not repre- 

 sent objects of nature, and which may be either conventional orcouuected 

 with lines of gesture-signs. 



