8 EXPERIMENTAL PLANT PHYSIOLOGY 



Monday, May 5th. Wet, still day. Temp. 13° G. 

 Readings. Intervals. 



A.M. 



9.57 

 10.17 20 min. 



10.37 20 „ 



10.56 19 „ 



11.15 19 „ 



Average, 19'5 min. 



The apparatus was then heated to 20° C. This was 

 done by placing it in a 7 lb. jam-jar containing water 

 at 30° C. ; the water was allowed to cool until it reached 

 20° C. and was then kept at this latter temperature by 

 the addition of small quantities of hot water. Readings 

 could not be taken for some time owing to the ex- 

 pansion of the water inside the gas-jar. As soon as 

 the temperature inside was constant, records were 

 made. 



Afterwards the apparatus was heated to 30° C, and 

 then to 40° C. by the same method. 



The whole day continued still and wet. 



