148 Botanical Microtechnique 



shiny green. Old leaves contain discoloring deposits in the cells. Kill 

 in FA A or Craf II. Other conservatory or native ferns may be pre- 

 pared by the same methods. 



The foregoing recommendations dealt with matme leaves. Ad- 

 vanced students are invariably interested in the development of the 

 leaf. The place and mode of origin of leaf primordia and the early 

 stages of leaf development are evident at the growing points of stems, 

 and the processing of suitable materials is discussed in the section 

 dealing with the stem. 



