614 



APPENDICES. 



A more complicated apparatus, combining both a warm stage 

 and a gas chamber, is shown in Fig. 248. This consists of a rect- 

 angular piece of ebonite (E E) fixed to a brass plate which rests 

 on the stage of the microscope. On the upper surface of the ebonite 

 is'another brass plate (P), with an aperture (G) leading into a brass 



FIG. 247. STEICKEK'S WARM STAGE. 



tube closed below by a piece of glass. To heat the apparatus the 

 copper wire B is placed on the tube a, and its extremity heated by 

 the flame of the lamp. The nearer the lamp to the stage the higher 

 the temperature, which is indicated by the thermometer (t). To 



J> 



FIG. 248. STRICKEB'S COMBINED GAS CHAMBER AND WARM STAGE. 



employ it as a gas chamber the wire B is laid aside, and the gas 

 is conducted into the chamber by the tube a', and escapes by the 

 tube a. 



Microtome Schanze's is much in favour in Germany, but 

 Jung's of Heidelberg, though a somewhat cumbrous instrument, is 



