REFERENCES TO LITERATURE OF MICROSCOPE 301 



150. . Objective changers, Micro 82. 



151. . Micrometer eyepieces, Micro 273. 



152. . Photographic eyepiece, Micro 373. 



153. . Bitukni attachment, Micro 412. 



154. . Spectacle magnifiers, Opto 5. 



155. . Homal, Micro 390. 



156. . Objectives and eyepieces. Micro 367. 



157. ZsiGMONDY, R. 1913. tJber ein neues Ultramikroskop, Physikal. 

 Zeitschr., 14: 975. 



