INTERPRETATION OF APPEARANCES 



[ CH. Ill 



To summarize this chapter and leave with the beginning student 

 the result of the experience of many eminent workers : 



i. Get all the information possible with the unaided eye. See 

 the whole object and all sides of it, so far as possible. 



2. Examine the preparation with a simple microscope in the same 

 thorough way for additional detail. 



3. Use a low power of the compound microscope. 



4. Use a higher power. 



5. Use the highest power available and applicable. In this way 

 one sees the object as a whole and progressively more and more details. 

 Then as the object is viewed from two or more aspects, something like 

 a correct notion may be gained of its form and structure. 



THE MICROSCOPE IN SECTION 



1. Positive ocular. 



2. Draw-tube. 



3. Maiu tube or bodv. 



-5. Society screws in the 

 ;draw-tube and body. 



6. Objective in position. 



7. Stage. 



8. Spring for holding- 



slides. 



9. Sub-stage condenser. 

 10. Iris diaphragm. 



11. Plane and concave mir- 

 ror. 



Horse-shoe base. 



Rack and pinion for 

 condenser. 



Flexible pillar. 



Spiral spring of fine ad- 

 justment. 



Fine adjustment 



Coarse adjustment. 



1 3 



