48 PRACTICAL BOTANY 



(chlorophyll) will be seen to be dissolved out of the 

 granules, but they will retain the same definite outline 

 as before. 



Similar observations should also be made on other 

 objects, e.g. the thin leaf of a Moss (e.g. Funaria), of 

 Vallisneria, or Elodea. For further details as to 

 chlorophyll see below. 



The various other bodies, which are found either 

 having definite form (such as aleurone grains), or in 

 solution in the cell-sap (such as Inulin), will be 

 described as opportunity offers, later in the book : a 

 special section at the end of the description of the 

 Angiosperms will be devoted to the study of the 

 nutritive materials stored in seeds and fruits. The 

 reactions by which the bodies commonly found as 

 components of the plant-body may be recognized are 

 stated concisely in Appendix B at the end of the 

 book. 



Remarks on Staining, Clearing, and Permanent 

 Mounting. 



Staining. It is often useful to stain sections in 

 order to bring out certain points in their structure, or 

 to distinguish between bodies of nearly the same re- 

 fractive index and appearance, but of different nature. 

 A very large number of colouring matters have been 

 used for this purpose, many of which are mentioned 

 in Appendix A : a very few of them will suffice for 

 ordinary laboratory work, and none are ever to ~be, used 

 without a definite purpose. 



