58 - 



STATION 74 

 (regular forenoon) 



May 26, 1958; 1709 GCT; 11°27'N, 88°44. 5'W; 1960 fm; wind, 040°, force 3; temp. , 85.9°Fciry, 79.9°Fwet; 

 weather, overcast; sea, moderate; wire angle, 45°; time zone 6. 



Submarine Daylight: 



Incident solar radiation: daily T 243 gm-cal/cm , day L 13. 00 hr. 



Biological Data 



Phytoplankton: depth (ra) of chlorophyll a (mg/m\ 1, 0.18; 5, 0.19; 15, 0.18; 25, 0.24; 50, 0.82; 100, 0.20. 



Water column cMorophyll a: 46 mg/m . 



Phytoplankton haul taken. 



Zooplankton: N-C N, u to 203 ra, 1907-2000 GCT, 114 ml T, 114 ml S; H at m, 1813-1843 GCT, 47 ml T, 47 ml S. 

 C N, H at 23 m, 2037-2052 GCT, 100 ml T, 100 ml S. 



a) Duplicate values: 86 m, 1.83; 335 m, 2.61 ng at/L. 



b) Pretrip; too uncertain for interpolation. 



