402 RESEARCHES ON FUNGI 



with sacking. The air in the test-tube surrounding the fruit- 

 bodies soon attained a temperature of 0° C, as was proved by 

 lifting the beaker and observing the thermometer. 



The fruit-bodies in the test tube were subjected to a temperature 



of 0°C. for a period of 11 

 hours. At the end of this 

 time, crushed ice was put 

 into a beaker of water and 

 well stirred. This water 

 soon attained a tempera- 

 ture of 0° C, as was shown 

 by a thermometer. I then 

 went into the dark-room 

 and waited there until my 

 eyes could readily perceive 

 the light given out by 

 some fruit-bodies in a small 

 damp - chamber. Miss 



Irene Mounce, who kindly 

 acted as my assistant, 

 then removed the inverted 

 beaker {d in Fig. 173), 

 lifted the test-tube (a) from 

 the ice-water in the ice- 



FiG. 173. — Apparatus for sub- 

 jecting fruit-bodies of Panus 

 stypticus p. f. luminescens to 

 a temperature of 0° C. The 

 test-tube a, fitted with a 

 thermometer held in place 

 with cotton wool ajid rubber 

 tubing, encloses two fruit- 

 bodies. The ice-water b 

 surrounds the test-tube and 

 is contained in a cavity of 

 the ice-block c of which only 

 a part is shown. The in- 

 verted beaker d, lined inside 

 with cotton wool, covers the 

 thermometer and holds the 

 test-tube upright. The fruit- 

 bodies, thus subjected to a 

 temperature of 0° C, con 

 tinned to give out light. 

 About f natural size. 



