Productivity . Fixation rate of inorganic carbon in milligrams of 

 carbon assimilated per hour per cubic meter of water unless otheiT^ise indi= 

 cated. 



Chlorophylls o Units given are approximately equivalent to milligrams 

 of pigments per cubic meter. 



Carotenoids , Units given are approximately equivalent to milligrams 

 of pigments per cubic meter. 



Productivity values obtained by the carbon=14 method are considered to 

 be measurements of the rate at which inorganic carbon is converted into plant 

 material in the presence of light, (minus the dark fixation rate) , Thus the 

 values given usually approximate net measurements of the primary productivity 

 rates of the plankton communities sampled. 



Pigment analyses are generally recognised as an index to the estimation 

 of the phytoplankton crop and its productive potential. 



The data presentation follows with only minor modifications the IBM 

 card layout developed in the Botany Department of the University of Hawaii. 

 Whenever adaptations from this scheme were necessitated by circumstances 

 they are indicated under "Cruise Information". 



For the Pacific and Atlantic Ocean two types of charts have been prcvided. 

 One shows the location of the Marsden statistical rectangles with the number 

 of primary productivity measurements effected within each Marsden division 

 between brackets. The other presents the cruise tracks or indicates the 

 area investigated. 



