26 



Lewis Knudson 



TABLE 4. Influence of Glucose on Timothy 

 (Plants grown in greenhouse. Duration, April 5 to May 27, 1913, fifty-two days) 



Culture solution 



Number 



of 



plants 



Total 

 dry 



weight 

 (milli- 

 grams) 



Average 

 weight 

 per 

 plant 

 (milli- 

 grams) 



Notes 



[1 

 Check no (sugar) i 2 



13 

 fl 



Glucose, 2 per cent \ 2 



13 



131 

 13 • 

 17 J 



41 

 70 



1.11 

 1.63 



Plants reddish 

 at base 



CULTURES IN DARK 



In the experiment to determine the influence of sugars in the dark, the 

 plants were grown in the same manner as in the preceding experiment. 

 The solutions used are indicated in table 5. All conditions of the experi- 



TABLE 5. Influence of Various Sugars on Timothy Grown in Incubator at 32° C. 



(Duration, fifty-two days) 



Culture solution 



Number 



of 

 plants 



Average 

 height 

 of tops 

 (centi- 

 meters) 



Total 

 dry weight 

 (milli- 

 grams) 



Average 

 dry weight 

 per plant 

 (milli- 

 grams) 



1 



Check (no sugar) \ 2 



3 



Glucose, 2 per cent ^2 



3 

 1 



Maltose, 2 per cent '12 



3 

 1 



Lactose, 2 per cent \ 2 



3 



6 

 29 

 10 

 27 

 15 

 14 



9 

 10 

 22 

 18 

 16 

 15 



2.30 

 2.02 

 2.00 

 3.95 

 5.26 

 5.85 

 3.88 



16 



10 



12 



0.11 

 0.28 

 0.24 

 0.24 



