CONTACT-PRESStJRES. 



263 



(1) The contact-relations of the young primordia. 



(2) The fact that an actual displacement of the corners of 



members growing in close contact does take place. 



Fig. QI.—EupJwrbia Wulfenii (Hoppe). Terminal system of weaker shoots, 

 (5 + 8) and (3 + 5). 



From the literature of the subject (Schumann, Schwendener, 

 Jost), it is clear that it is impossible to prove the first point of 

 contact- relation to the satisfaction of all, since many cases occur in 

 which the question of lateral contacts would be described differently 



