MINUTE STRUCTURE. 

 A B 



73 



Fig. 20. A, tran.sver.se, B, longitiKlinal section of root of Cattleya intermedia, from the circumference to tin 

 centre, shown in a horizontal position, enlarged 30 diameters. The Bnmerals as in Fig. 10. 



N^>J 



J-^^ 



Fig. 21. A similar transverse section of root of Wimhi 

 tricolor, enlarged 25 diameters, .showing develop, 

 ment of corky tis.sue at A, 



Fig. 22. Fragment of transverse section of root of 

 Cyprijmiium iiisigne, from the circumference to the 

 centre, enlarged 25 diameters. 



1, epidermis with root hairs ; 2, cortical tissue ; 3, 

 endoderniis ; 4, fundamental or soft tissue of root ; 

 .5, axial cylinder of vascular bundles surrounding a 

 central pith. 



