100 SIEVE-TUBE ELEMENTS 



5. Outline briefl}' the experimental evidence as to the role of 

 the phloem in the trans-location of organic solutes (cf. Crafts, 

 1939b). 



REFERENCES 



1. Abbe, L. B., and Crafts, A. S., Phloem of White Pine and 

 Other Coniferous Species. Bot. Gaz. 100 :69r)-722. 1939. 



2. Crafts, A. S., The Relation between Structure and Function 

 of the Phloem. Amer. Jour. Bot. 26 :172-177. 1939a. 



3. , . iMovement of Viruses, Auxins, and Chemi- 

 cal Indicators in Plauts. Bot. Rev. 5 :471-504. 1939b. 



4. Eames and MacDaniels, pp. 69-76 and Ch. VIII. 



5. Esau, K., Ontoojenv aud Structure of the Phloem of Tobacco. 

 Hilgardia 11 :343-424. 193S. 



6. , , Development and Structure of the Phloem 



Tissue. Bot. Rev. 5 :373-432. 1939. 



7. , , Phloem Anatomy of Tobacco Affected with 



Curly Top aud I^Iosaic. Ililo-ardia 13 :437-490. 1941. 



8. Hayward, pp. 614-616. 



