ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



361 



brass. The mirror is flat, with lateral displacement. The hand supports 

 are covered with leather. This model can be supplied with a glass cover 

 to the stage, and a laterally movable arm for the lamp-holder. 



A New Construction of the Preparation Microscope.* — F. K. 

 Studnicka shows how the usual Microscope-stage can be used with the 

 preparation Microscope described in a previous abstract-! A reversed 

 achromatic objective (Reickert's No. 2) is screwed on to a thread as near 



p.. 



||^^■v;v;'■^^-^-••^:•^W) 



Pig. 44. 



the bottom end of the tube as possible. The ordinary objective, which 

 is intended for the magnification of the reversed image of the object, is 

 fastened to the lower end of the draw-out tube. The ocular is placed 

 as usual. The whole arrangement is thus combined and can be focused 

 by rack-and-pinion. The application of the instrument is, however, 

 controlled by the limits within which the rack-and-pinion admit the 

 tube movements. In using weak magnifications the working distances 



* SB. k. Bohm. Gesell. der Wiss., 1905 (v.) 4 pp., 1 fig.), 

 t See this Journal, 1905, p. 643. 



