TISSUES AND SIMPLE ORGANS. 



125 



Fig. 69 A. — Vertical section through 

 the leaf of Sambucus nigra. " Arm- 

 palisades." 



(After Haberlandt.) 



Fig. 71. — Vertical section through 

 the leaf of Juglans regia. 



Palisade-cells are supposed to be richly, 

 the spoiifry tissue cells less richly, sup- 

 plied with chlorophyll. Both celi-forins 

 are here typically developed. (After 

 Haberlandt.) 



Fig. 69 B. — Vertical section through the leaf, including the midrib, of Rapha- 



nus sativus. 

 (After Haberlandt.) 



—P» 



Fig. 70. — Vertical section through the leaf of Flcus 

 elnstica. The epidermis is omitled, 



p andpi, Palisatle-cells ; a. collecting cells ; s. paivnchyma- 

 sheath ; g, vascular bundle. (After Haberlandt.; 



Fig. 72. — Lower surface of 

 an " isol:iter;il " leaf, Sil- 

 phiuvi. Idci/tidtiim. 

 (After Haberlandt.) 



