is mounted and which may be placed upon the ordinary stage of 

 the microscope, as shown in the subjoined figure. 



In this form the Reflecting Condenser need not be specially 

 adapted, but is ready for use with any microscope. The Condenser 

 Plate is merely placed upon the stage and held in position by the 

 ordinary clips. Large stands have as a rule centreing stages but 

 in their absence it is not a very difficult matter to centre the con- 

 denser plate by hand. To facilitate this operation the upper surface 

 of the condenser has ruled upon it two small concentric circles, 

 which should be brought into the centre of the field of a low power 

 lens. The axis of the condenser is thereby made to approximately 

 coincide with the axis of the microscope. The final adjustment 

 should, after the manner described above, be effected under a high 

 power. The adjustment of the Reflecting Condenser along the axis, 

 which is of the utmost importance, is accomplished with the aid 

 of the lever shown in the illustration of the Reflecting Condenser 

 B. The latter should be so placed upon the microscope stage that 

 the lever is towards the observer. 



Reflecting Condenser B. 



