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 

 (fig. 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.- Bakefs DissxHng Microscope. the milled-head being situate 



