32 



TRANSLOCATION IN PLANTS 



of materials stored at the time of ringing and the effect 

 of the rings in isolating the particular region in question 



3.6 



3.5 



3.4 



5.5 



^11 



3.1 



h3.0 



2.9 



2.8 



2.7 



2.6 



2.5 



5pm 

 JcinlUh 



7.0 - 



o6.5 - 



6.0- 



C5 



g^5.5 



5.0 



4.5 



ip) 



(b) 



Fig. 4. — Effects of position of leaves and rings on the distribution of carbohydrate 



in the bark and stem of the cotton plant. (From Mason and Maskell.) 



Numbers refer to numbers in Fig. 1. 



(a) Total carbohydrate in defoliated regions 



"Normal: leaves at apex" similar to No. 3, but leaves below ring removed. 

 "Normal: leaves at base" similar to No. 1, but leaves removed above upper ring. 

 "Ringed: leaves at apex" similar to No. 2, but leaves below lower ring removed. 

 "Ringed: leaves at base" similar to No. 2, but leaves above upper ring removed. 

 (6) Concentration of total sugars in sap of bark 



"Leaves at apex: high region." The part analyzed was equivalent to the leafy part 



immediately above the defoliated region in No. 3. 

 "Leaves at apex: middle region." The part analyzed was equivalent to that of the 



defoliated region in No. 3. 

 "Leaves at base: middle region." The part analyzed was equivalent to the defoliated 



region in No. 1, but leaves above upper ring were removed. 

 "Leaves at base: lower region." The part analyzed was equivalent to the leafy part 



immediately below the defoliated region of No. 1, but leaves above upper ring were 



removed. 



from sources of supply or regions of utilization. Swarbrick 

 (1927) seems to have been troubled by these varying 



