148 APPENDIX II 



Catalogue). Very thin sections may be placed in strong 

 alcohol to bleach, and kept there indefinitely. They should, 

 however, be placed in water for about an hour before being 

 examined. 



If compound microscopes are available, the study of the 

 histology of the stems of the Sunflower, Cosmos, Corn, Wal- 

 nut, etc., may be carried on more thoroughly, and several 

 exercises devoted to it. 



VI. The teacher should explain thoroughly the signifi- 

 cance of the ordinary association of these three kinds of 

 structures. 



VII. Indian Corn stem may be preserved in the same 

 way as the Sunflower or Cosmos stem. 



VIII. Sections may be cut in the same way as in the 

 case of the stem of the Sunflower. 



X. To be contrasted with the statement in VI. 



XII. The Basswood or Linden and the Sycamore or But- 

 tonball are excellent stems for this purpose. Sections may 

 also be cut of these stems upon the hand microtome. 



CHAPTER V 



LEAVES. I 

 General Reading 



Kerner and Oliver, Volume I, Part 2, pp. 593-597, 626-640. 

 Allen, The Story of the Plants, pp. 33-53. 

 Lubbock, Flowers, Fruits, and Leaves, pp. 97-147. 

 Gaye, The Great World's Farm, pp. 157-176. 

 Gray, Text-book, pp. 85-106; Elements, pp. 49-59. 



