PHYSIOLOGICAL CHARACTERISTICS OF AXIATE PATTERNS 99 



blue reduction and the susceptibility gradient, which concern the ecto- 

 derm only. The respiration of the large supporting cells which till the in- 

 terior of the Corymorpha stem is probably extremely low. Determinations 

 of oxygen uptake in stems of Tuhularla (Hyman, 1926a) and Ohelia (Lund, 



TABLE 3 



Oxygen Uptake of Distal and Proximal Halves and Distal 



Middle, and Proximal Thirds of the Naked Stem 



of Corymorpha palma 



(From Child and Hyman, 1926) 



HALVES 



THIRDS 



1928c, 1931a) also show a decrease basipetally; and, according to Lund, 

 oxygen uptake shows a differential susceptibility to cyanide; that is, the 

 decrease in oxygen uptake by a given concentration of KCN is greater in 

 apical than in basal pieces. Barth {Biol. Bull., 78, 1940) also finds a 

 basipetal decrease in oxygen uptake in Tubularia. 



