396 IOWA ACADEMY OF SCIENCE 



The device is made by bending eight strips of zinc 15x200 

 mm. into the channels (a) (figure 45). These are soldered in 

 position according to the diagram, to the 20x140 mm. zinc strip 

 (b) which is then bent into a rectangular form with the chan- 

 nels on the inside. The strip (c) 1x26 cm. is then soldered to 

 the ends of the strip (b) forming a handle with which to lift 

 the frame, and a guard to prevent the slides from falling out at 

 the bottom. 



This piece of apparatus has proved particularly handy in 

 staining work where most of the slides require the same treat- 

 ment. 



Department of Botany, 

 State Teachers College. 





