82 A New Illuminating Apparatus for the Microscope. 
interpose a large glass globe filled with water coloured of a moderate 
blue tint in order to transfer the luminosity of tbe smaller flame to 
the more extended surface of tbe mirror. This is attained when tbe 
point of tbe cone of light issuing from tbe lens or globe falls on 
the mirror and renders its entire surface luminous . — Max Schultzes 
‘ Archiv,' vol. ix., p. 474. 
