66 



P. M. COOK 



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 in 



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T — \ — I — I — \ — \ — I — I — I — I — r 



CONTINUOUS CULTURE PROCESS 

 CHLORELLA PYRENOIDOSA 

 ARTIFICIAL LIGHT 

 4" COLUMN 



J I L 



J I L 



.1 .2 .3 .4 .5 .6 



POPULATION DENSITY, 



grams dry weight per liter 



Fig. 8 — Continuous culture process using Chlorella pyrenoidosa under ar- 

 tificial light; 4 in. colum. Yield plotted against population density. 



