RESPIRATION 55 



in each jar with the burning taper. What infer- 

 ence may be drawn from the result? 



11. Next, pour into each jar a bit of clear lime water, 

 and wash the air by tipping the jars back and forth, 

 holding the half containing the plant material upper- 

 most. What conclusion does the result justify? 



12. Clearly state the general conclusion from this ex- 

 periment. 



C. The Temperature Change Accompanying Plant Res- 

 piration : 



Experiment 39. To ascertain what temperature change 

 accompanies the respiration of germinating seeds. 



1. Place a quantity of germinating seeds (e.g., oats, 

 wheat, lupine) into a Dewar flask. Into a second 

 Dewar flask place nothing. 



2. Into each flask insert a thermometer (being sure 

 first to compare their readings). The bulb of the 

 thermometer in the flask containing the seeds 

 should be well covered by them. Place the flasks 

 where they will not be subject to great nor unequal 

 changes of external temperature. 



3. After twenty-four hours record the temperature 

 indicated by each thermometer. 



4. Thoughtfully discuss and interpret the results ob- 

 served. 



5. Compare the process of fermentation with that of 

 respiration. What inference is suggested by this 

 comparison as to the real nature of respiration? 



