336 



DISCOVERY REPORTS 



values within the area at the time. The highest pH value in the South Shetlands survey 

 of 1929 is equal to the lowest pH value in the South Georgia survey of 1928-9. It is 

 not an impossible conception that the animal organisms may be adjusted at different 

 times to work in media of different alkalinity, and that increases a little beyond the range 

 to which they were at the time adjusted might be effective in bringing about a change 

 in behaviour. 



* The data for February have been omitted because of the evidence, already given on p. 288, that the 

 phytoplankton in this month had died down. 



Table LXXIII 

 Stations at which pH determinations zvere tnade arranged in order of ascending phyto- 

 plankton values, expressed as millions of cells per N 50 V haul, together zvith average 

 pH values for top 50 m. State of zveather and time of day also given 



Beaufort weather notations: 

 b. = blue sky. 

 b.c. = blue sky and some cloud. 

 c = cloudy sky. 

 o. = overcast. 



f. = fog. 

 m. = mist, 

 s. = snow, 

 v. = unusually good visibility. 



