16 LABORATORY METHODS OP 



1. Take the stage micrometer and place it upon 

 the stage of the microscope. 



2. Build a platform as high as the stage of the in- 

 strument, using books for the purpose. 



3. Place upon your platform a piece of white paper. 



4. Now focus the lines on the stage micrometer, 

 keeping both eyes open. 



5. The lines on the micrometer will be seen upon 

 the paper. 



6. Now make a pinhole in the paper between any 

 two lines. 



7. Multiply the distance between the pinholes in 

 the paper by the denominator of the fraction on the 

 scale of the micrometer. The product will be the mag- 

 nifying power of the instrument. 



The Microtome is an instrument that is used to cut 

 tissue into very thin sections. 



The Paraffine Bath is an apparatus that is used to 

 infiltrate the tissue with paraffine. 



The Cornet Forceps is an apparatus used to hold the 

 cover glass. 



The Centrifuge is an apparatus used to precipitate 

 the solid from a fluid. 



Slides and Cover-Glasses are accessories used to re- 

 tain or protect the tissue (or object). 



