THE FLOWERING PLANT. 99 



FIG. XXII. A portion of an isolated pitted vessel, seen en face. 



FIG. XXIII. Section through the partition wall between two pitted vessels. Gund- 

 lach's th immersion. 



FIG. XXIV. Transverse section across i. -ii. of the main root of Fig. V., after harden- 

 ing in alcohol. 



The section passed through a young lateral root. A. 2. 



FIG. XXV. The greater portion of the same, more highly magnified.* 

 No note is taken of the intercellular spaces. D. 3. 



FIG. XXV. a The bundle- sheath of the above enlarged. Gundlach's ^th immersion. 



* Sections such as this, to show the typical arrangement of the parts of the root, must be cut low down near the 



apex. 



