MALLERY. | IN GUIANA. 145 
s 
continued friction with stones and moist sand. The two kinds seem never to occur 
in the same place or even near to each other; in fact, a distinct line may almost be 
drawn between the districts in which the deep and shallow kinds occur, respectively ; 
the deep form occurs at several spots on the Mazeruni, Essequibo, Ireng, Cotinga, 
Potaro, and Berbice rivers. The shallow form has as yet only been reported from 
the Corentyn river and its tributaries, where, however, examples occur in consider- 
able abundance. But the two kinds differ not only in the depth of incision, in the 
apparent mode of their production, and in the place of their occurrence, but also— 
and this is the chief difference between the two—in the figures represented. 
Fig. 106 is a typical example of the shallow carvings. 
: 
Fic. 106.—Shallow carvings in Guiana. 
Fig 1104, infra, is a similar example of the deep carvings. 
The shallow engravings seem always to occur on comparatively large and more 
or less smooth surfaces of rock, and rarely, if ever, as the deep figures, on detached 
blocks of rock, piled one on the other. The shallow figures, too, are generally much 
larger, always combinations of straight or curved lines in figures much more elabor- 
ate than those in the deep engravings; and these shallow pictures always represent 
not animals, but greater or less variations of the figure which has been described. 
Lastly, though I am not certain that much significance can be attributed to this, all 
the examples that I have seen face more or less accurately eastward. 
The deep engravings, on the other hand, consist not of a single figure but of a greater 
or less number of rude drawings. * These depict the human form, monkeys, 
snakes, and other animals, and also very simple combinations of two or three straight 
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