LIMITING FACTORS TO GROWTH MEASUREMENTS. 315 



Table II. 

 June 19, at Anuradhapura. 



June 21. 



Taking these tables and other observations made at Pera- 

 deniya together we find that unless exposed to sunlight the 

 bamboo culms tend to heat up and cool down more slowly 

 than the air. If the bamboos are in the shade the air rises in 

 temperature at daybreak faster than the bamboo, and we get 

 as a rule at about 8 or 8.30 a.m. the air temperature higher 

 than the bamboo temperature. If the morning is dull, as 



