102 



INTERPRETATION OF APPEARANCES 



[CH. Ill 



To summarize this chapter and leave with the beginning student 

 the result of the experience of many eminent workers : 



1. 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. Main tube or body. 



4-5. 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. 



12. Horse-shoe base. 



13. Rack and pinion for 



condenser. 



14. Flexible pillar. 



15. Spiral spring of fine ad- 



justment. 



16. Fine adjustment 



17. Coarse adjustment. 



