JACQUES LOEB 



353 



Fig. 15. Showing that reduction in size of apical leaf diminishes its inhibitory 

 power. On the left, five stems each with large size leaf at apex, on upper side of 

 stem. Inhibition of shoot formation complete except in one stem where a shoot 

 is formed in the lower bud of the second node. On the right, five stems each with 

 reduced leaf on the upper side. Four out of five stems form shoots and two of 

 these do so in the upper bud of the second node. Root formation and geotropic 

 curvature are considerably larger in stems with whole leaf than in stems with 

 reduced leaf. Duration of experiment, Oct. 29 to Nov. 23. 



