A158 have produced seeds which are smaller and weigh 
less than self pollinated A158. This phenomena is not 
universal because controlled pollinations of teosinte on 
the New England Flint, Wilburs Flint, produced hybrid 
seed which are indistinguishable in size and weight from 
self-pollinated Wilburs Ilint. 
Discussion 
Maize and teosinte are fully fertile, and in the Nobo- 
game Valley the two hybridize naturally. Maize X teo- 
sinte hybrids are known from other regions in Mexico 
and Guatemala, but Nobogame is unique because hy- 
brids are in some cases cultivated because the inhabitants 
feel they improve the maize and in others the hybrids 
are unknowingly planted in the maize fields. 
Wild teosinte is abundant in the region, and hybrids 
are almost as abundant in the fields as on the margin of 
the fields. Because the method of cultivation of maize 
has not changed appreciably in the last hundred years 
this pattern of an abundance of teosinte hybrids on the 
seed ears Is suspected to have been widespread in the 
past in regions where it is almost extinct today. Such a 
pattern of hybridization with teosinte would account for 
the widespread tripsacoid characteristics now found in 
the races of maize on the Central Plateau (Wellhausen 
et al., 1950) and adjacent regions. This hybridization in 
the past would also explain why the teosinte of the 
Central Plateau is one of the most maize-like races of 
teosinte. 
The observations of the incorporation of teosinte seg- 
ments from chromosome 9, and possibly 4, are interesting 
also because Sehgal (1963) has shown that, under experi- 
mental conditions, incorporationof teosinte chromosomes 
9 and 4, either alone or in combination, in a uniform 
maize-inbred, increases the length of the cob. It is pos- 
— B05 | 
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