CLIMATE AND COMPOSITION 271 
wheat from the humid area. The average protein 
content of the wheat of the United States is a little 
more than 12 per cent; Stewart and Greaves found an 
average of 16.76 per cent of protein in Utah dry-farm 
wheats of the common bread varieties and 17.14 per 
cent in the durum varieties. The experiments con- 
ducted at Rothamsted, England, as given by Hall, 
confirm these results. For example, during 1893, a 
very dry year, barley kernels contained 12.99 per 
_ cent of protein, while in 1894, a wet, though free- 
growing year, the barley contained only 9.81 per cent 
of protein. Quotations might be multiplied con- 
firming the principle that crops grown with little 
water contain much protein and little heat- and fat- 
producing substances. 
Climate and composition 
The general climate, especially as regards the length 
of the growing season and naturally including the 
water supply, has a strong effect upon the composi- 
tion of plants. Carleton observed that the same 
varieties of wheat grown at Nephi, Utah, contained 
16.61 per cent protein; at Amarillo, Texas, 15.25 per 
cent; and at McPherson, Kansas, a humid station, 
13.04 per cent. This variation is undoubtedly due 
in part to the varying annual precipitation but, also, 
and in large part, to the varying general climatic 
conditions at the three stations. 
