MALLERY.] PALIMPSEST PETROGLYPHS. AL 
The existence of two or three different sets of markings, all visi- 
ble and of different degrees of obliteration or distinctness, is in itself 
important; but, in addition to that, it is frequently the case that the 
second and third in the order of time have associated with them dates, 
from which the relative antiquity of the faintest, the dateless, can be 
— 
Fig. 2.—Palimpsest on Fairy rocks, Nova Scotia. 
to some extent estimated. Dates of the third and most recent class 
are attached to English names and are associated with the forms of Eng- 
lish letters; those of the second class accompany French names, and in 
some cases have French designs. Figs. 1 and 2, about one-fourth orig- 
inal size, are presented to give an idea of these peculiar palimpsests. 
