338 



DISCOVERY REPORTS 



Table LXXVI 



pH values from 0-200 m. depth at stations in South Georgia survey of December-January 

 1926-7 arranged in order of ascending phytoplankton values 



N = Night stations. 



Attractive by its simplicity as is the idea that differences in alkalinity, due to varying 

 degrees of photosynthesis, might modify vertical migration, we must recognize that 

 such differences in alkalinity as we have observed hardly give it support. In Table XIV 

 on p. 83 are shown examples of increased oxygen content in the upper layers due to 

 increased phytoplankton production ; but in the survey as a whole there is little correla- 

 tion between oxygen and phytoplankton from station to station, as shown in 

 Table LXXVII. 



