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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 57 



Fig. 4. — Light-assimilation curves from first experiment corrected by arbitrary 



growth factors. 



Ordinates, carbon dioxide assimilated. Multiply by 0.025 to obtain cubic 



centimeters per minute. 

 Abscissas, light intensity. Multiply by 3.56 X 10"* to obtain watts/cm'. 



Multiply by 4.96 to obtain foot-candles. 

 Parameters, carbon dioxide concentrations. Multiply by 0.000041 to 



obtain volume per cent. 



2 4 C e 10 



Fig. 5. — Growth factors from first experiment. 



Arbitrary factors applied to Figure 3. 



. . . . Factors obtained from leaf measurements. 



Factors obtained from respiration measurements. 



Ordinates, numerical factors. 



Abscissas, duration of experiment in days. 



