30 



Lewis Knudson 



TABLE 8. Influence of Various Sugars on Growth of Radish 

 (Two plants in each culture. Duration, February 5 to April 17, 1914, seventj'-one days) 



Dry weight (in grams) 



Check 

 (no sugar) 



Saccharose, 

 2 per cent 



Alaltose, 

 2 per cent 



Glucose, 

 2 per cent 



Lactose, 

 2 per cent 



0.960 

 0.620 



0,605 

 775 



1.200 

 0.950 



1.900 

 0.900. 



1.250 

 1.200 



3.060 

 .0 900 



2.250 

 0.850 



2.200 

 1 . 150 



1.760 

 1.820 



1.220 

 2.170 



1.520 

 1.720 



1.720 

 2.670 



1.910 

 1.160 



2.170 

 1.140 



2.400 

 1.000 



1.350 

 1.050 



1.900 

 ■ € 500 









0.835 





2.400 

 0.700 



1.000 

 1.150^ 



1.500 

 2.500 



2.000 

 1.200 



] 200 



0.950 





700 







1 520 







900 







1.030 







900 







1 330 







0.730 







1 380 









1.300 



















1 







1 





Average 0.791 



Average 1.237 | Average 1.572 i Average 1.713 , Average 1.128 



All the sugar cultures, with the exception of those containing 2 per 

 cent of glucose plus 2 per cent of fructose produced better growth than 

 did the check cultures having no sugar. Comparing the glucose cultures 

 with the check cultures it is noted that the dry weight of the former 

 is more than double that of the latter. Maltose and glucose are some- 

 what similar in- their effect. Lactose, also is evidently absorbed and 

 assimilated by the plant. IMolliard (1907) also reported the use of lactose, 

 although according to him it was utilized only slightly by the radish. 



