20 



GENERAL BIOLOGY 



shaded portion illustrates the further detail of a certain 

 structure in the walls. Fig. 5, a cell in the process of divi- 

 sion, is shaded in a manner which will bring out the details 

 of cellular structure. 



The following suggestion may be helpful: Make the 

 drawings large, leave considerable space between them and 

 have them symmetrically arranged on the page. In start- 



FIG. 4. 



FIG. 5. 



ing a drawing make all lines very faint, and when the form, 

 proportions and arrangement of parts is satisfactory go over 

 the lines with a smooth continuous stroke, producing a line 

 of the desired strength. The drawing must represent the 

 actual specimen studied, should show the real structure 

 rather than the mere appearance, and should be finished 

 in the laboratory while the specimen is under observation. 



