7 6 



BOTANICAL GAZETTE 



[JULY 



Kraus found that the reducing substances increased on the convex 

 side of the responding organ up to the time of visible curvature, and 

 then decreased on that side of the curved shoot, a point upon 



TABLE I 



Determination of material per gram fresh weight 



Time stimulated 



Sample I, unstimulated 



8.74 (right) 



9-35 deft) 



Sample II, stimulated 15 min. 



1 1 . 88 (upper) 



1 2 . 05 (lower) 



Sample III, stimulated 30 min. 



10.38 (upper) 



10.38 (lower) 



Sample IV, stimulated 1 hour 



11.58 (upper) 



1 2 . 20 (lower) 



Sample V, stimulated 1 . 5 hours 



7.17 (upper) 



7 . 09 (lower) 



Sample VI, stimulated 2 hours 



10.23 (upper) 



10. 15 (lower) 



Sample VII, stimulated 3 hours 



9.32 (upper) 



9 . 05 (lower) 



Sample VIII, stimulated 4 hours 



9.69 (upper) 



9.66 (lower) 



Sample IX, stimulated 5 hours 



6.92 (upper) 



7 . 63 (lower) 



F. 



Total 



nitrogen 



(g.) 



o . 004800 



0.004535 



Lost 

 Lost 



Lost 

 Lost 



o . 004346 



0.004353 



0.004238 

 o . 004448 



Beginning visible response 



18.65 

 21.50 



23.IO 

 28.25 



23-05 

 23-45 



21 . 10 

 26.75 



0.003697 



0.003838 



0.004421 

 0.004738 



0.003985 

 0.004144 



0.004855 

 0.004593 



which he has frequently been misquoted (14, pp. 87 and 89). 

 The total nitrogen remains constant throughout, the unstimulated 

 sample I showing almost identically the value of sample IX at the 

 close of the experiment. 



