greatest difficulty, as in some instruments the move- 

 ment of the fine adjustment is in a direction opposite 

 to that of the micrometer screw, and thus the objective 

 as well as the object is endangered. 



If the microscope is to be carried any distance it 

 should be done in its case. 



Avoid exposure of the microscope to direct sunlight 

 and extreme or sudden changes in temperature. If by 

 chance the microscope should have become very cold, 

 as during transportation in winter, allow it to warm 

 gradually. 



Care of the Stand. Keep free from dust is one 

 of the first rules to be observed. When not in use place 

 the microscope in its case or cover with a bell jar or 

 close mesh cloth such as cotton flannel or velvet which 

 should reach to the table. If the case will not receive 

 the entire outfit, remove the double or triple nose-piece, 

 if these form part of it, and place objectives in their 

 cases. If dust settles on any part of the instrument 

 remove it first with a camel's hair brush and then wipe 

 carefully with a chamois skin, wiping with the grain of 

 the finish of the metal and not across it, as in the latter 

 case it is likely to cause scratches. 



When handling the stand, grasp it by the pillar or 

 stage. While the arm is the most convenient part it is 

 at the same time the most dangerous to the fine 

 adjustment. 



