i STUDIES OF AXIJIAL LIFE. 



clear as before. (Exercise the greatest care in 

 order not to injure the lens.) 



STJMMAEY OF THE STEPS IN THE USE OF THE 

 MICROSCOPE. 



1. Put on the objective. 



2. Place the preparation on the stage. 



3. Get the light. (Mirror.) 



4. Focus. (Coarse adjustment and fine adjustment.) 



5. Adjust object in the field. 



6. Regulate the light. (Mirror and rotary disk.) 



E. Exercises in the Use of the Microscope. (Dem.) 



1. Place a preparation of a letter on the stage in such 



a way that the letter is in the natural position. 

 Sketch the letter in this position without looking 

 through the microscope. 



2. Without changing the position of the letter, examine 



it with the Ioav power (l.p.). Show by a sketch 

 the efi^ect of the microscope on the apparent posi- 

 tion of the letter. 



3. Use a hand lens. Does it have the same effect as 



the compound microscope ? 



4. Use high power (h.p.), sind compare the appearance 



of the letter under high power with that under 

 low power. Which would be better for making 

 a sketch of the entire letter ? 

 When would you use a hand lens ? Low power ? 

 High power ? In what order ? 



2. THE CELL. 

 A. Independent Cells. 



1. Ascertain whence the material you are to study was 



