EXPLANATION OF THE ILLUSTRATION 
Prare XLVIL. Typical ears of Cristalino de Chi- 
huahua, a type of flint-dent corn occurring in the 
state of Chihuahua. This race is believed to be the 
product of three more or less independent lines of 
descent converging in northwestern Mexico: Chap- 
alote, an ancient indigenous variety ; Harinoso de 
Ocho, originally from South America; and intro- 
gression from teosinte. This race appears to have 
affinities with some of the modern maize of the 
American Southwest. Seale 1 em. = 1.82 em. 
(From Wellhausen ef a/, 1952.) 
