JACQUES LOEB 



707 



this happened, the air roots in the upper part of the stem began to 

 dry out and were not replaced by new roots. The inference must 

 be drawn that the luxurious growth of the roots at the basal end of 



Fig. 18. The same stems as in Fig. 17, 8 days later. The basal roots in water 

 have now commenced to develop and as a consequence the air roots, located 

 higher up and formed before, commence to dry out and fall off. 



Fig. 19. The same stems as in Fig. 18 but 9 days later. The air roots'have 

 practically disappeared. The basal roots in water are developing rapidly. 



