University of California Publications in Agricultural Sciences [Vol. 1 



It is shown here that as the amount of water is increased the 

 protein content decreases. 



Others have also observed the effect of water upon the com- 

 position of crops. Mayer, in Holland, showed that on a soil 

 having 10 per cent of water the crop contained 10.6 per cent of 

 protein, while on a soil with 30 per cent of water the protein 

 percentage was ouh" Q.Q. Carleton calls attention to the fact 

 that in the same varieties of wheat grown in the humid and arid 

 regions of the United States the protein content was 11.94 per 

 cent for the former and 14.4 per cent for the latter. Experi- 

 ments conducted at Rothamstead, England, show that barley in 

 a wet year contained 9.81 per cent of protein and in a dry year 

 12.99 per cent. 



The particular connection of this review of the observation 

 of other workers to the results here presented lies in the dif- 

 ferences in the results secured in 1906 between the Modesto and 

 the Yulia City stations, at the former of which both the per- 

 centage of typical kernels and the protein content in the progeny 

 was distinctly higher than at the latter. These three factors are 

 contrasted below. 



A very casual observation of these results shows that both 

 the distinct diiference in percentage of typical kernels and that 

 between the protein content of the grain of the two stations was 

 without doubt very strongly, if not entirely, determined by the 

 dift'erence in moisture which the grain received after planting. 



EXPEEIMENTS OF 1907 

 In 1907 the experiment described above was continued at 

 Modesto and Yuba City, and also extended to Tulare. The 

 results are stated below. 



