Some Relationships of Phyto plankton to Environment 285 



useful indicators of their distribution. The beneficial or restrictive 

 effects of certain external metabolites may effect the growth rates 

 and photosynthesis of phytoplankton organisms and may con- 

 tribute to the biological selection of organisms occurring in 

 blooms. 



This paper is given in tlie hope that useful criticisms and 

 suggestions may be forthcoming. It is fully realized that each 

 section presents a very incomplete picture, and poses more prob- 

 lems than it solves, but it is a picture of research in progress, 

 not of an accomplished program. Moreover, the program has 

 to be fitted to the facilities available, and tliese in oceanography 

 are usually a compromise. 



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