4. The predominance of Chapalote and its subraces 
suggests that the prehistoric corn and the agriculture 
which they represent have stemmed directly from south- 
ern Mexico where the wild corn with which domestica- 
tion began was identified as a progenitor of the still 
existing Mexican race Chapalote. 
5. Beginning at about 1850-1450 B.C. there is evi- 
dence of the introgression of teosinte into corn. More 
than half of the identified cobs were classified as Tripsa- 
coid Chapalote. 
6. Several specimens of maize-teosinte hybrids furnish 
direct evidence of the hybridization of maize and teosinte. 
7. A new race, Breve de Padilla, which became the 
predominating race in the last phase, A.D. 1450-1800, 
may bea hybrid of Chapalote with the western Mexico 
race Harinoso de Ocho. 
[ 49 ] 
