PLANKTON AND NUISANCE CONDITIONS IN SURFACE WATER 63 



greater. Many wastes, such as those of paper and chromium plating indus- 

 tries, are indirectly or directly toxic, even though they leave the oxygen 

 content of water largely unaffected. Such toxic effects may likewise be 

 nuisances. Prevention of pollution or poisoning of shellfish areas, bathing 

 beaches, lakes, and streams is better than cures. And if the biochemist 

 or chemical engineer can achieve prevention by recovery of useful by- 

 products as an economic measure, very little legislation will ever be neces- 

 sary. 



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