Influence of Certain Carbohydrates on Green Plants 33 



The variety of radish was the same as that used in the preceding experi- 

 ment, the seeds varying between 12 and 14 miUigrams in weight. On'y 

 one seed was sown in. each flask. The experiment was begun on February 

 8 and closed on April 15, the duration being sixty-six days. The results 

 are given in table 11: 



TABLE 11. 



Intlxjence of Equimolecular Solutions of 0.05 Molecular 

 Concentration on Growth of Radish 



(Duration, sixty-six days) 



Culture solution 



Dry 



weight 



(miUigrams) 



Sugar 



absorbed 



(milligrams) 



Check (no sugar) . . 





[1 



fl 

 J2 



30 

 35 

 100 

 175 

 125 

 140 

 100 

 75 

 120 

 162 

 195 

 185 

 145 











Maltose 









3 



4 



/I 









Lactose 









12 



/I 





Glucose 



80.6 



Saccharose 





\2 



fl 



] 2 



75.6 

 105.0 



86.2 







3 







It was hoped that the experiment would yield decisive results, for orig- 

 inally ten cultures were prepared for each sugar and fourteen for the 

 check. Only a few of the seeds showed good germination, however, and 

 consequently only thirteen of the original fifty cultures developed plants. 

 The results nevertheless do show the very favorable influence of the 

 sugars on growth. Lactose again is the least beneficial, yet it markedly 

 increases the dry weight. 



In none of these cultures was a storage root produced. In one saccharose 

 culture not included in the table, which was badly contaminated with 

 a species of Penicillium and a species of Fusarium, an enlarged root 2 

 centimeters long by 1 centimeter in diameter was produced. This pro- 

 duction was probably due to the augmented carbon dioxide content 



