Reduction of Tracing on Muslin of 
Photographic 
Amer. Philos. Soc. Oct. 1884. 7 ‘Trae 
PICTURE ROCK, 
MONONGAHELA RIVER, 
VION Yo 
4S NO PHI OG 
Fo 
Tw 
CNA E BRET AGOVE GROUND. 
soen OF ROCK 
3 ao | 
A 
FIGURE ON SIDE EAST END, 
OF ROCK, B, \ 
