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