PLATE XLII 



Fig. I. — Portion of a primary root of Pride of Saline com, showing the number and 

 relative size of the secondary roots. Both the primary and secondary roots of the com 

 are larger than those of the Dwarf milo or standard kafir. 



Fig. 2. — Portions of the primary roots of BlackhuU kafir, showing the number and 

 relative size of the secondary roots. Both the primary and secondary roots of Dwarf 

 milo and BlackhuU kafir are smaller and more fibrous than those of the com. The 

 number of secondary roots per unit of length of primary root is twice as great for 

 BlackhuU kafir and Dwarf milo as for the com. 



