CLASS DEMONSTRA TIONS 



[CH. VII 



The microscope for the individual student and the projection 

 microscope for the teacher furnish most efficient aids in getting 

 back to nature in the study of minute structure and morphology. 

 Models and diagrams are very desirable aids in study and teaching, 

 but the real things should never be made secondary to models and 

 diagrams.* 



* For a full consideration of the Projection Microscope see: Gage: Part 

 I., The Origin and Development of the Projection Microscope ; Part II., Mod- 

 ern Projection with directions for installation and use. 



FlG. 160a. Watson & Sons' Edinburgh Students' Microscope (Stand G). 



