18 



GROWTH OF PLANTS 



When the north wind blew for a considerable time the concentration of 

 salt at Station 26, Pungo Ferry, reached values as high as 60 per cent 

 of sea water, nearly as high as the salt concentration in the waters about 



SCALE* 



Figure 7. Map of the Back Bay, Virginia, and Currituck Sound, North Carolina, 

 region, showing the location of salt testing stations, named and hsted according to their 

 order in Figure 6. 



Norfolk. On the other hand, when the south wind blew during long periods, 

 the salt in Back Bay was as low as 3.2 per cent of sea water. These titration 

 studies proved beyond doubt that considerable salty water was blo^^^l from 

 Norfolk region through the Albemarle and Chesapeake Canal and North 

 Landing River into Currituck Sound and from this region it gradually moved 

 through the channel east of Knott's Island into Back Bay. This was the 



