II 



PRACTICAL EXERCISES ON THE STRUCTURE OF THE 

 VEGETABLE CELL INVOLVING SIMPLE METHODS OF 

 PREPARATION 



Before entering upon the work described below, the pre- 

 ceding pages should he carefully read through, otherwise 

 the beginner will be apt to make serious mistakes in 

 manipulation. 



NOTE. The method of mounting fresh material in 

 water will be used throughout this chapter : it has the 

 following advantages : 



1. It is the simplest possible. 



2. The cells are seen unaltered, i.e. in the living 

 state, and it is thus specially suitable for observations 

 on fresh material. 



3. When thus mounted the effect upon the living 

 cell of any reagent soluble in water may be observed 

 by irrigation : thus it is the natural starting-point for 

 the study of the micro-chemical reactions of the living 

 cell. 



It is however open to objection on the following 

 grounds : 



