170 Bulletin Jard. Bot. Buitenzorq, Série III, Vol. V. Livr. 2. 



FiRS. 31 and 32. Sections showing crescent-shape of the yoiing leaves. X 30. 



Fig. 33. Cross section tlirougli a young leaf shuwing three pairs of leaflets. 

 This due to the fact tliat leaflets are already pointing obliquely upwards 

 closely pressed to-gether arranged upon the rachis in a shingle like fashion 

 so that they overlap. A section through such an arrangement cuts through 

 several pairs of leaflets. The leaflets are still angular. X 30. 



Fig. 34. Cross section through somewhat older leaf. X 30. 



Fig. 35. Cross section in saine stage as above but more higlily magnified. Leaflets 

 although undifferentiated are split. Thèse are held to-gether in part by the 

 original enveloping tissue, the cells of which are seen hère running in a 

 vertical direction. This tissue is seen in upper left hand side of the 

 figure. X 80. 



Fig. 36. A later stage in cross section where the leaflets hâve elongated aiid lost 

 their angular character. Thèse leaflets are still held to-gether. X 30. 



Plate V. 



Fig. 37. Longitudinal section of growing point and young leaflets. in the outer- 

 niost leaf the leaflet 'Anlagen' are seen as aggregates or cushions of 

 cells. X 80. 



A cushion or cell aggregate more highly magnified. X 250. 

 Section shovving the 'Anlagen' in a more advanced stage, seen liere 

 as a wavey Une. The cells of surrounding tissue above distinct. X 80. 

 Another section of the same leaf showing the cells surrounding the 

 leaflets much larger. X 80. 



A tangential section through an older leaf, the ends of the leaflets 

 seen. X 80. 

 Section through leaflet showing sac-like character. X 60. 



Plate VI. 



Fig. 43. Two year old plant with several leaves removed to show distribution of 

 the fibres and also the sheath with its criss cross fibres going over intoa 

 dry leathery condition. X L 



Fig. 44. Sheath in young stage of development. X 20. 



Fig. 45. Froni above sheath at Y Y showing parallel arrangent of cell rows. X 120. 



Figures 46 to 50. Stages of development of hairs of the sheath. X 450. 



Fig. 51. Full grown hair. X 450. 



Fig. 52. Minute stomata on inner surface of sheath. x 450. 



Plate Vil. 



Fig. 53. Longitudinal section through secondary root and cross .section through 

 the mother root. Secondary roots and pneumathodes originate endogenously 

 in exactly the same way. The large air chambers arise long before the 

 secondary root structures. X 100. 



Fig. 54. . Section a little beyond the growing point of the root showing the radial 

 arrangement of the parenchyma just prior to the formation of air 

 chambers. X 100. 



