84 PICTURE-WRITING OF THE AMERICAN INDIANS. 
Every large bowlder seems to contain some traces of previous inscription, and in 
many instances the pictured side of the bowlder is on its under side, showing that 
it has been detached from its original place. The natural agencies are quite suf- 
ficient to account for any amount of this kind of displacement, for the rocks in their 
present condition are not refractory and offer no great resistance to the wear of 
weather and ice; but in addition to this must be added human agencies. 
Amongst other things, they represent the conventional Indian serpent’s head, with 
varying numbers of lines. 
Some of the signs next frequently recurring were concentric circles, in some cases 
four and in other cases a lesser number. 
Fig. 45 is a reproduction of Prof. Frazer’s illustration. 
Fic. 45.—DBald Friar rock, Maryland. 
This region was also referred to by Dr. Charles Rau (a), his cut 
from the specimen in the collection of the Smithsonian Institution 
(Mus. No. 59010) being here reproduced as Fig. 46. 
During the autumn of the years 1885 and 1889 Dr, Hoffman visited 
these rocks, securing sketches and measurements, the former of which 
are reproduced in Figs. 47 and 48. The figures are deeply cut, as if 
rubbed down with sand and a round stick of green wood. The deepest 
channels, varying from three-fourths to 14 inches across and almost as 
deep as they are wide, appear as if cut out with a gouge, and for this 
reason bear a strong resemblance to the petroglyphs in Owens valley, 
California, In whatever manner these sculpturings were made, it is 
——O6 2 eas 
