PLATE 6 
The type of spring balance and lifting device used in the transpiration measurements. 
The balance was checked against a standard weight of 130 kgm. each morning before 
and after the weighings. The pot is 16 inches in diameter and 26 inches high. The 
cover is provided with i-inch holes, as used with alfalfa and sorghum. The center 
hole is used for watering. 
