THE ROLE OF STUDY OF ALGAE IN DEVELOPMENT OF BOTANY 48 1 



Cultivation of Chlorella on a large scale out of doors is quite different from 

 cultivation of it in small batches in the laboratory. This introduces many 

 new problems, especially those of an engineering nature. Thus far, outdoor 

 cultivation has been in pilot plants with a capacity of a thousand or more 

 gallons of culture medium. In one such outdoor pilot plant it has been esti- 

 mated (Burlew, 1953, p. 272) that when operated under optimum conditions 

 the dry- weight yield would be at the rate of 100 pounds per acre per day. 

 This is at the rate of 17.5 tons per acre per year. As yet the costs per pound 

 of Chlorella for running such pilot plants are so high that it is economically 

 unprofitable. 



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