161° 160° 159° 158° 157° 156° 155° I54°l6r 160° 159° 158° 157° 156° 155° 154° 



ZT 



20° 



HUGH M SMITH CRUISE 12 » 

 10/23- 1 1/3/51 



HUGH M SMITH CRUISE 17 

 9/5- 9/15/52 



161° 160° 159° 158° 157° 156° 155° I54°I6I° 160° 159° 158° 157° 156° 155° 154° 



FIG. 15 LINES OF EQUAL INORGANIC PHOSPHATE CONCENTRATION {^g at/L) FOR THE 

 SURFACE, AS FOUND ON TWO CRUISES OF THE HUGH M SMITH 



45 



