RECENT AMERICAN MICROSCOPES 217 



to give the stability required in utilising the hinged joint for 

 inclination of the body, which stands on a strong uiiial pillar. 

 The sub-stage is movable by a quick screw ; in other features it 

 resembles the majority of the microscopes of the type to which it 

 belongs ; it is, however, distinguished by rounded in contrast 

 to sharp and pointed corners and edges ; and, although the form 

 presented has a plain stage with clips, it can be furnished with 

 a circular revolving centring stage, or with an ' attachable ' stage 

 made by the Spencer Lens Company, having all the advantages of 

 tlie several forms of these pieces of apparatus already described. 



FIG. 174. 



il.xlel, No. '2 U89H). 



We note with some sin-prise that such accomplished manu- 

 facturers and opticians have indicated, so far as we can discover, no 

 advance in their suit-stage condenser beyond that of the now old 

 achromatic of Abbe. and that there is no evidence before us of their 

 employment of a sub-stage fine adjustment, both of which have been 

 found of such great practical value in England, and which have been, 

 as \ve shall shortly show, adopted for the more critical microscopical 

 work by the Messrs. Zeiss, the leading optical firm of the Continent. 



