98 



THE MICROSCOPE. 



filled with water if required. Under this is the mirror 

 for transparent illumination, and the light from it is passed 

 through a circle of glass in the centre cf the trough. The 



Fig. 52. Lawson's Dissecting Microscope. 



instrument is admirably adapted for the wants of students 

 in the preparation and dissection of microscopic objects, 

 and also answers well for botanical investigations. 



A cheap form of Dissect- 

 ing Microscope, represented 

 in the annexed woodcut 

 ffig. 53), has been con- 

 structed by Mr. Baker. 

 The instrument consists of 

 a solid circular foot of brass, 

 from the border of which 

 arises a firm pillar support- 

 ing the stage which is of 

 ample dimensions and a 

 firm horizontal bar, into 

 which the lenses are 

 screwed. The latter is ele- 

 vated and depressed by a 

 rack and pinion movement, 

 Pig. 53.- Baker's Disstaing Microscope, the milled-head being situate 



