276 Transactions of the Society. 



To find an object already registered : focus on focusing mark, 

 adjust pointer over registering mark, move slide so that pointer 

 stands over part of label indicated by register — then the object 

 should be in field of objective. The slide must be kept in contact 

 with bar or stops on stage. 



If the Microscope has only spring clips to stage, the pointer has 

 two points, or other equivalent means of adjustment, parallel with 

 the ruling in label. The right-hand point is set to registering 

 mark, left-hand point on line continuing from it horizontally, the 

 objective being focused as before ; the only necessary variation in 

 use being to remember to indicate with the right-hand point, and 

 keep slide in such position that both points are equidistant from 

 any horizontal line on label. The slide may be moved vertically 

 or horizontally, but must finally be adjusted parallel to its first 

 position, or the object will not be in field. 



