2O4 



PRACTICAL MICROSCOPY. 



this case, may also be faintly ruled into squares, and by 

 this means, especially after a little practice, very accurate 

 drawings can be made. Enlargements and reductions can 

 also be just as easily 

 drawn. A glance at 

 Figs. 1 86 and 187 will 

 illustrate this. The for- 

 mer represents what the 

 observer is supposed to 

 see upon looking down 

 the eye-piece of the 

 microscope ; while the 

 latter delineates the 

 figure produced by the 



pencil upon the ruled 



FIG. 186. 

 paper. 



FIG. 187. 



