118 University of Calif ornia Publications in Agricultural Sciences [Vol.1 



morning hours about one half of each plat throughout the period 

 of cooling. From the time the grains were well up until the 

 spring rains ceased a layer of ice was spread on a loose frame 

 and placed over one half of each plat, within four inches of the 

 top of the plants, every night during the first half of the growing 

 period of the plants. A portion of the north half of each plat 

 was left uniced. To retain more effectively the cooled air during 

 the night the iced portion of the plats was entirely covered by 

 a piece of heavy canvas. 



In this experiment two varieties of common wheats and five 

 strains of durum wheats were used. The composition of each 

 sample harvested is shown below: 



Table 14. — Showing Effect of Reducing Night Temperature Upon the 

 Composition of Wheat Kernels 



Cooled First Period 



