IV 

 Figure 6. 



Plankton volumes: relative concentrations on Grids I-V, April 18-23, 1952. 



150- 



DROGUE STATIONS 



TIME 



150- 



ANCHOR STATIONS 



100- 



s 



1 2 



5 6 7 



9 10 U 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 

 STATION 



Figure 7. Plankton volumes (ml./l.OOO m. ' water strained) on drogue and anchor stations, April 18-23, 1952. Times 

 are idealized to the 4-hour intervals discussed in the text. (See table 1 for actual times). 



39 



