ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 



603 



and is thence reflected on to the object beneath it. The strongly illu- 

 minated object is now reflected on to a second and similar mirror like- 

 wise at 45° to the optical axis but at right angles to the first (fig. (>8), 

 and after incidence on the objective is projected on to the screen. The 

 objective has a diameter of 120 mm. The whole apparatus is inclosed 

 in a frame with plush curtains resembling a camera. The designers 

 say that it is very suitable for projecting drawings, insects, butterflies, 

 or for such an object as a live fish in water. 



Simple Illuminating Apparatus for Loup Preparations and for 

 Microscopy.* — 0. Bender has found his contrivance (figs. 69 and 70) 



Fig. 69. 



very useful, as it enables an operator to be independent of variable 

 daylight. He fits a bent metal arm to the rod of an ordinary Microscope 

 lamp (or incandescent gas jet) with opaque cylinder. This metal arm 

 carries a plane mirror inclined at 45° to the path of the beam emer- 

 gent from the orifice of the cylinder. The light after reflection at the 

 mirror travels down on to the loup, fixed in a ring jointed on the arm, and 

 thence impinges on the object. The arm carrying the ring can also be 



* Zeitschr. wiss. Mikrosk., xxiii. (1906) pp. 36-38 (2 figs.). 



2 R 2 



