54 



Lewis Knudson 



In another experiment the influence of a mixture of saccharose and 

 maltose was studied. The conditions of this experiment were identical 

 with those of the preceding. The results, given in table 21, show that 

 2 per cent of maltose permits greater growth than that of the checks, 

 and that the addition of saccharose increases the growth still further. 

 Evidently the sugars are absorbed and assimilated. 



TABLE 21. Influence of a Mixture op Maltose and Saccharose on Growth of 



Cabbage 



(Plants grown in greenhouse. Duration, twenty-nine days) 



Culture solution 



Average 

 weight 



per plant 

 (miUi- 

 grams) 



Check (no sugar) < ^ 



Maltose, 2 per cent 



Maltose, 2 per cent, plus saccharose, 0.4 per cent. , 

 Maltose, 2 per cent, plus saccharose, l.G per cent 



7.9 



5.7 



11.2 



12.7 



14.0 



In another experiment a culture containing 2 per cent of maltose plus 

 0.2 per cent of saccharose, with fourteen plants, yielded a dry weight 

 of 138 milligrams, while a culture containing 2 per cent of maltose plus 

 1.6 per cent of saccharose, with the same number of plants, yielded 

 a dry weight of 155 milligrams. 



EXPERIMENT WITH SWEET CLOVER (MELILOTUS ALBA DESR.) 



In the experiment with sweet clover the plants were grown in large 

 test tubes, on a nutrient solution plus 1.2 per cent of agar. The seeds 

 were sterilized by immersion for twenty-four hours in the hypochlorite 

 solution. Seven seeds were sown in each test tube. Not every seed 

 germinated, as is indicated in table 22, in which only the average results 

 of the cultures are given. Unfortunately the results from the different 

 cultures are not entirely comparable, owing to the difference in the number 

 of plants per culture. Still this difference is sufficiently small to warrant 

 the general conclusion that increase in concentration results in increased 

 growth. 



