THE MICROSCOPE AND ITS PARTS. 
23 
purpose. This finder consists of a photograph, small 
in size, of a number of squares figured consecutively in 
order, two numbers in each square; and it is used thus: 
the worker, coming on a spot which he wishes to 
register, removes the preparation and substitutes for it 
the finder, noting what square is in the field. When, 
at any future time, he wishes to find the same spot, he 
places the finder on the stage, finds the square pre¬ 
viously noted, removes the finder and replaces it by the 
preparation. In both cases, for marking by the figures 
on the stage, and for finding by the finder, there is on 
the stage a stop , against which the preparation and the 
Fig. 5. 
finder are placed. Few of our leading pathologists or 
bacteriologists use a mechanical stage, and the trouble 
to those who have to photograph their preparations is 
often immense—as when some particular organism is 
to be found—and our friend, Mr. E. C. Bousfield, has 
designed an extremely useful little apparatus for “Malt- 
wooding” on a plain stage. It is figured here, No. 3, 
and is made by Mr. C. Baker. 
