predominantly short and broad, flinty in endosperm tex- 
ture, and, except for being slightly larger, are similar to 
those of Chapalote. 
Dark Cave 
Trench 4, Level 6 (30-36"). About 775 kernels (182 
grams, kernels weighing 23.6 grams per hundred). The 
kernels are almost identical in size, shape and color to 
the kernels of modern Chapalote (Plate X X XIX, inset, 
Figs. C and D). A few kernels have red pericarp. 
Trench 4, Levels 5 and 6 (24-86). About 8,000 ker- 
nels (709 grams, kernels weighing 23.2 grams per hun- 
dred). Like the kernels from Level 6, these are similar 
to modern Chapalote in size, shape and color. There is 
very little evidence that this race, at this stage, has been 
modified by the introgression of other races. 
Trench 4, Level 1 (0-6"). One fragment similar to 
Cristalino de Chihuahua, Five kernels (Plate X LIV); 
three are small and brown like Chapalote; one is small, 
white and flinty; one is large and broad, and similar in 
size and shape to the kernels of modern Harinoso de 
Ocho. It is the only one from any of the caves referable 
to this category. It is possible that large, floury kernels 
would not have been as easily preserved as flinty kernels 
of other races. 
ARCHAEOLOGICAL LEVELS AND TypEs OF MAIZE 
The relationship between archaeological levels and 
types of maize is simple, direct, and obvious: 1) All of 
the maize from the lower levels, 3 to 14 (with the possi- 
ble exception of two intrusions in Level 3 of Swallow 
Cave), is related to Chapalote—the only type of maize 
found at the lower levels; 2) The maize of the upper 
levels, 1 and 2, comprises four types, Chapalote, Tripsa- 
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