BOOKS AND CURRENT LITERATURE 



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plankton and the controlling factors nine stations were established. In 

 the first section of the paper the salt content of the water, light, tem- 

 perature, and the amounts of carbon dioxide and oxygen are discussed, 

 and the varying intensity of these factors at the several stations is 

 shown and is held to be responsible for the differences in distribution 

 of the various forms. In the second section the author discusses the 

 biology of the plankton, their form, structure and life-cycles, and brings 

 to our attention the various associations (samfund). The greater por- 

 tion of the publication is given over to the listing of the plankton and 

 the description of their distribution. The author has listed 145 species, 

 of which one is new, and has given in tabulated form the distribu- 

 tion of each species for the nine stations during the entire year. — A. 

 L. Bakke. 



