14 PRACTICAL HISTOLOGY. 



(i.) Searchers, which reduce to its lowest limits the available 

 magnification with each objective, thus facilitating the preliminary 

 examination of objects, diminishing the labour of searching for 

 particular parts of the specimen. Thus, No. i enables an objective 

 to be employed with its own initial magnifying power, i.e., as if it 

 were used as a simple lens without an ocular (Zeiss). 



FlG. 15. New College Microscope, by Swift & Sons Tripod Stand. 



(ii.) The working eye-pieces begin with a magnifying power of 4. 

 The most useful are 4 and 6. Other eye-pieces arc 



(iii.) Projection eye-pieces ; but they do not concern us here. 



14. In selecting a microscope, there are many points to be 

 attended to. 



