760 



are transported. From Dixon's point of view, liowever, it might be 

 objected that in Cuhtis's experiments tiie peripheral woodlajers were 

 injured und thereb\' the transport along liie i)eriplierai xyieem had 

 been suspended indirectly. 



Tills objection can hardly be raised against the above experiments, 

 in which a coaling of bnlter of cocoa was spiead on the injured 

 part. 



Fig. 2. 



Moreover, another series of ringing experiments was carried out. 



In these experiments the ringing was performed as much as 

 possible aseplically by previously washing the branch bark with 

 96 V. alcohol and then peeling it ofi" aseptically down to the cam- 

 bium. Subsequently the decorticated surface was covered with steri- 

 lized absorbent cotton wool saturated with water; tinally the whole 

 was wrapped up with wax laffeta. 



These experiments were carried out mid-June in the same way 

 as the others described above, and yielded after four weeks an 

 unequivocal result in connection with the midsummer growth which 

 was very abundant, especially in Aescnius. 



With the normal yellow variegated siioois the formation of mid- 

 summer growth occurred at the top of the branch and the yellow 

 young leaves contrasted sharply with the others, which liad been 

 damaged by the high wind and browned by the sun. (See photo). 



