UPWARD TRANSPORT OF ORGANIC MATTER 



25 



selected and treated as indicated in Fig. 2 (Curtis, 1920a). 

 Number 1 was left as a check with no treatment whatever. 

 Number 2 was ringed and leaves left above the ring, in 

 part to test whether the ring interfered with water move- 

 ment to the leaves and in part to see if leaves could supply 



Fig. 2. — Drawing to indicate methods of treatment for studying the effects 

 of rings on the upward transport of solutes into growing shoots. 1, leafy check; 

 2, leafy ringed; 3, defoliated check; 4, defoliated ringed. Ring wounds were 

 always protected with melted paraffin and the stems were attached to the parent 

 plant. '• 



materials for growth. Number 3 was defohated for 

 a distance, usually 10 to 20 cm. or to the base of the shoot, 

 to determine the effects of defohation alone on growth. 

 Number 4 was defoliated to the same extent as No. 3 and 

 the stem was ringed at the base of the defohated region 

 to see if the material necessary for the growth of the shoot 

 could be carried through the xylem from the manufacturing 



