which probably represent the backcross or segregating 
progenies derived from the hybrid. The typical hybrid 
type (Pima Papago) combined the higher kernel row 
number (12 rows) of Chapalote with the wider cupules 
(6 to 10 mm.) of Maiz de Ocho. When the mixed modi- 
fication is toward Maiz de Ocho, the specimen is scored 
as Maiz de Ocho Mix. When the direction is that of 
Chapalote, it is identified as Chapalote Mix. The data 
upon which the races and forms were identified and the 
phase of cultural association for the various specimens 
are given in Tables [I and III. 
THE MaIZE FROM THE ARTIFICIAL LEG SITES 
All of the 13 cob fragments of maize from the Artifi- 
cial Leg Sites were completely carbonized. ‘Ten of these 
came from Site I dated at A.D. 550 to A.D. 700, two 
from Site II dated at A.D. 750 to A.D. 800, and one 
from Site III dated at A.D. 870 to A.D. 980. The hy- 
brid race, Pima Papago, predominates and the larger 
collection (Site I) contains a few specimens similar to its 
parents, Chapalote and Maiz de Ocho. The latter appear 
to be parental-type segregates from the hybrid rather 
than independently derived pure entities (Table IV). 
Pima Papago is presumed to have been more success- 
ful at first than its introduced parent, Maiz de Ocho and, 
thereby, to have traveled northward from the Sierra 
Madre Occidental at a faster pace. It is unfortunate that 
more specimens were not available from Site III. The 
single specimen available was of a modified form of Maiz 
de Ocho which may well represent a segregate from the 
hybrid. 
Apparently in the more northerly climates natural 
selection favors the eight-rowed derivatives. Further 
north across the boundary into southeastern Colorado, 
the Chapalote type segregates almost disappear while 
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