232 THE HISTORY AND DEVELOPMENT OF THE MICROSCOPE 



foot when the instrument is in an upright position. When inclined, 

 the centre of gravity is again brought directly over the foot, as 

 -lio\vH in fig. 185, by rotating the pillar upon a reliable fitting at 

 its base, so th;it absolute steadiness is secured. This is a revival 



Fie. 185. Ross's in \\ bacteriological microscope (1894). 



ID <>ld form made in 17(50 by J. ( 'nil', adapted by A. Ross in 

 and now again used by Ilie same linn (ride fig. 128). 



also manufactures an Kdncational' microscope having 

 which may fairly V placed in this class. It 



