ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 



771 



Koristka's Projection Apparatus for Liquid.*— The disposition of 

 the various parts of this apparatus are shown in fig. 122. The source of 







light is an electric arc lamp ; the light passes through collecting lenses 

 to the mirror up through the axis of the Microscope to a totally 

 reflecting prism. 



* Koristka's Catalogue, xiii. (i908) pp. 91-6, fig. 86. 



