So 



DISCOVERY REPORTS 



Figs. 7 and 8 on pp. 12-15. The key chart provided with these figures should be con- 

 sulted for comparison with the figures in this section. Table IX shows the phytoplankton 

 and phosphate content of the upper 100 m. at stations on the A line (north-west of South 

 Georgia) passing from the outer station WS 30 to the inner station WS 27. St. WS 52 

 is the intermediate station between the A and G lines. Here we see a close correlation 

 between the higher phytoplankton production and the reduced phosphate content at 

 St. WS 30. As already explained on p. 70 Mr Clowes agrees that the patch of water with 

 high phytoplankton content at St. WS 30, marked with letter B in the phosphate chart, 

 Fig. 39, is likely to be a portion of the area of mixture from further south carried round 

 by the swirl from the region marked A. 



Table IX 



Phytoplankton and phosphate content, South Georgia survey, 



December-January 1926-7, line A 



Table X shows the low phytoplankton and high phosphate content at all stations, 

 passing out from the coast, on the B line (that running due north) and at St. WS 26 

 between lines A and B. 



On the C line (running north-east), and the intermediate stations 124 and 125, shown 

 in Table XI, there is a lower phosphate content down to 40 m. at St. 124, where the 

 phytoplankton is highest. 



On the D line (that running almost due east) and the intermediate stations WS 38 

 and WS 39 between D and C, there is a small phytoplankton production ; at the inner 

 stations 134 and 135 the phosphate content is lower than the outer ones. This is well 

 explained by a reference to the water-movement chart Fig. 6 and the phytoplankton 

 chart Fig. 38. The water at the inner stations has flowed round from the western side of 

 the island from the region of heavy phytoplankton production, the phytoplankton 

 having presumably died or been grazed down by zooplankton in transit. 1 

 1 This is further discussed on p. 84 in reference to the F line. 



