2l8 APPENDIX 



III. Bajieel. 



1. Eyepiece or Ocular: The lens at the top of the 



draw tube. 



2. Draw Tube: The tube capable of being with- 



drawn, containing the eyepiece at the upper end 

 and the objective below. 



3. Objective: The lenses at the lower end of the 



draw tube, ordinarily ranging in focal distance 

 from I inch to 1-6 inch. They are named 

 from this focal dislance. 



4. The Revolving Nosepiece: A contrivance for hold- 



ing two or three objectives for immediate use. 



SUGGESTIONS ON THE USE OF THE MICROSCOPE. 



1. Put the slide on the stage under the clips with the 

 object to be studied over the opening in the diaphragm. 



2. See that the lens is in the proper position in the barrel 

 (always use the low power, i. e., the longest focal distance 

 unless otherwise directed), and with the coarse adjustment 

 bring the objective close to the cover glass. Place the eye 

 over the eyepiece and look for the object; lift the barrel with 

 the coarse adjustment until the object on the slide appears 

 clearly defined. It is now said to be in focus. 



3. After the object is in focus, use the fine adjustment 

 to clear up the diflferent parts of the specimen. Move the 

 specimen until all the parts have passed the field of the mi- 

 croscope. It will be noticed that the image is inverted 

 as well as magnified. An explanation for this should be 

 sought from the teacher or from a good text on the micro- 

 scope. 



4. The compound microscope is a delicate instrument, 



