12 
Colorado Expp:riment Station. 
feed in depth, except where alfalfa or sagebrush roots had gone 
before. These soils are unexcelled for potato growing because, in 
Figure 3.—Photomicrograph of a potato seedling at the 
stage when the root cap commences to lose masses of cells 
if slightly rubbed. 
Figure 4.—The same seedling as P^gure 3, more highly 
magnified. 
our judgment, of the slope, which prevents soakage, and of the 
climate of the region. In a level and warmer country they probably 
