560 



seems best to express the production of a body of water in vol- 

 ume per cubic meter. I have therefore used this basis through- 

 out my paper, and employ it in the following table of compara- 

 tive production in some of the representative bodies of water 

 thus far reported. 



RELATIVE PLANKTON PRODUCTION BASED UPON MAXIMUM RECORD. 



*Reduced to settling method of measurement by multiplying by 5. See Juday ('97). 

 tAU records for our stations reduced to settling method of measurement by multi- 

 plying by 2. See page 256. 



A comparison of this maximum production in these various 

 localities, upon the basis either of plankton per square or cubic 

 meter, ranks our localities (barring Spoon River) among the 

 more fertile regions. If the content per cubic meter be the ba- 



