32 



Lewis Knudson 



In each culture having two plants one of the plants was usually larger 

 than the other. It is not possible, therefore, to select individual plants 

 as a criterion of the influence of the sugar. The total yield of each culture, 

 or the average yield, affords the only means of comparison. 



The influence of saccharose on the growth of radish is shown in table 10: 



TABLE 10. Influence of Saccharose on Growth of Radish 

 (Duration, February 16 to April 17, 1914, sixty days) 



Dry weight (in grams) 



Check 



Saccharose, 

 2 per cent 



0.900 

 0.800 



1.100 

 1 . 100 



0.800 

 0.570 



1.555 

 0.600 



0.870 

 0.400 



1.300 

 1.100 



1.206 

 0.470 



2.200 

 0.350 





1.240 

 0.720 





1.320 

 0.750 





1.200 

 0.600 



Average 0.752 



Average 1 . 081 



INFLUENCE OF EQUIMOLECULAR SOLUTIONS OF VARIOUS SUGARS 



In the preceding experiments approximately carbon-equivalent solutions 

 were employed. In the following experiment isotonic solutions were 

 used, the concentrations of the various solutions tested being 0.05 mo- 

 lecular. Liter flasks were employed as culture vessels, each containing 

 200 cubic centimeters of the nutrient solution plus 0.5 per cent of agar. 



