124 PRACTICAL TEEATISE ON THE MICROSCOPE. 



scope Stand, as seen in Plate 3 at d d, or may be provided 

 with a support of its own, as adopted by Messrs. Powell and 

 Lealand. If necessary, both the large and small condenser 



Fig. 72. 

 may be mounted on the same stem and foot, as represented in 

 fig. 73, a plan adopted by Mr. Leonard; by this means the 

 two may be used either separately or combined. All the 



Fig. 73. 



different methods of employing the two forms of condensers 

 will be fully explained in the chapters devoted to the illumi- 

 nation of opaque and transparent objects. 



