DIRECTIONS FOR USING A MICROSCOPE 



23 



There are usually one or two clips fastened on the upper surface of the stage. 

 These are slipped over the edges of the slide to hold it stationary. 



Professor R. H. Chambers has devised a microscope under which he can dissect out portions 

 of a cell or inject fluids into the different parts of the cell. The drawings (upper right) show, 

 how he tears the cells apart. The other illustration is a photomicrograph showing a phase in 

 the actual operation. 



Directions for caring for a microscope. In lifting or carrying 

 the microscope, grasp it firmly by the special handle above the 

 stage, and carry it in a horizontal position. Then the removable 

 parts cannot fall and break. 



Allow nothing to touch any of the optical parts except espe- 

 cially prepared lens paper or a clean linen handkerchief, other- 

 wise the ground surfaces will be scj'atched. 



Before putting the microscope away, turn the nosepiece so that 

 the objectives are not in a line with the tube. They are then 

 protected by the stage, and the microscope is not apt to be 

 damaged in placing it in the case. 



Turn the clips in so they will not be broken. 



Always follow the rules given below, for focusing. 



