206 APPENDIX. 



Cut off the end of the root including some of the 

 youngest hairs and mount it in a drop of water. Show 

 on your sketch that the hairs are outgrowths of single 

 superficial cells. 



iv. Sketch a longitudinal section of the apex of a 

 Maize root, to show the very obvious root cap. 



No. IV. 



THE HERBACEOUS STEM. 



i. Cut transverse sections of a piece of the young 

 stem of Sunflower (Helianthus annuus) or of Jerusalem 

 Artichoke (Helianthus tuberosus), preserved in alcohol, keep- 

 ing the razor well moistened with spirit. Soak the sections 

 in water for a minute or two and place a thin section on 

 a slide, add one drop of Schulze's solution, and cover in a 

 minute or two, when stained. Sketch your section under 

 low power, showing 



a. epidermis ; 



b. cortex, whose deepest layer is the endodermis 

 surrounding 



c. the central cylinder, consisting of 



(1) vascular bundles, separated by 



(2) medullary rays, radiating out from the 



(3) pith. 



Sketch, under high power, a single vascular bundle, 

 showing, towards the periphery, 



a. pericycle fibres \ each with very thick walls and a 

 small lumen, 



1 The bast-fibres of the pericycle do not form part of the bundle; 

 see p. 56. 



