306 
PACIFIC SCIENCE, Vol. XV, April 1961 
the air temperature, and for short periods of 
high solar radiation a leaf temperature 7.6° C. 
above the air temperature was recorded. Gen- 
erally, leaf temperatures of both pineapple and 
papaya were below the air temperature during 
the night except for one period in which clouds 
moved into the area. At 0400, April 12, with 
five-eighths cloud cover and calm wind, the tem- 
perature of the pineapple leaf rose to 0.3° C. 
above the air temperature. 
REFERENCES 
Ekern, P. C. Personal communication. 
Geiger, R. 1950. The Climate Near the Ground. 
Harvard Univ. Press, Cambridge. P. 276. 
Waggoner, P. E., and R. H. Shaw. 1952. Tem- 
perature of potato and tomato leaves. Plant 
Physiol. 27: 710-724. 
