If the immersion oil should have become thick, or 

 any substance adheres to the surface, which cannot be 

 removed by wiping, apply a small amount of benzine 

 to a cloth and wipe carefully but quickly, so that the 

 fluid will not affect the setting of the lens. Wipe clean 

 with dry cloth. 



Do not apply alcohol to objectives under any con- 

 dition. 



If any part of the microscope cannot be brought to 

 a satisfactory working condition by the foregoing 

 instructions, or any part is injured by accident it should 

 invariably be sent to the maker or to a well known 

 manufacturer of microscopes. 



