THE SWEET POTATO. 101 



Fig. 13 — Continued. 



c. Latex canals. 



d. Endoderniis. 



e. Pericambium. 



f. Protoxylem. 



g. Internal phloem. 



Fig. 14. Diagram of cross-section of base of stem of Florida. 



a. Epidermis. 



b. Cortex. 



c. Endodermis. 



d. Pericambium, 



e. Phloem. 



f. Cambium. 



g. Xylem. 

 h. Vessels, 

 i. Tyloses. 



k. Cambium of internal phloem. 



1. Fundamental tissue. 

 FitT. 15. Cross-section of old stem of Southern Queen. 



a. Epidermis. 



b. Hypodermis. 



c. Cortex. 



d. Latex canals. 



e. Endodermis. 



f. Pericambium, 



g. Phloem, 

 h. Cambium, 

 i. Xylem. 



j. Vessels, 



k. Protoxylem. 



1. Internal cambium, 



m. Internal phloem, 



n. Fundamental tissue. 

 Fig. 16. Development of reversed bundle in cross-section of old 



stem of Red Jersey. 



a. Normal metaxylem. 



b. Protoxylem. 



c. Internal phloem. (?) 



d. Abnormal metaxylem. 



e. Internal phloem. 



f. Oil cells in fundamental tissue. 



g. Crystal cells. 



