Prare XIII. A. Tassel branches from the San An- 
tonio phase, A.D. 1450-1800. All specimens are 
similar in their botanical characteristics to the 
staminate tassel branches of modern corn where 
the spikelets occur in pairs, one member sessile, 
the other pedicelled. Actual size. B. The pistillate 
part of a prehistoric spike of T’ripsacum and the 
staminate part of another spike. Why 7'ripsacum 
should have been collected and preserved in the 
save is puzzling. Actual size. C. Some of the cobs of 
Tripsacoid Chapalote are fragile like the spikes of 
teosinte and break up into disc-like segments (left) 
which resemble closely the segments of some de- 
rivatives of modern maize-teosinte hybrids (right). 
These prehistoric specimens furnish indirect evi- 
dence of the hybridizstion of maize and teosinte. 
Direct evidence of such hybridization is provided 
by the maize-teosinte hybrids illustrated in Plate 
XII, B. D. Quids, the product of chewing tassels 
(left, center) and a stalk (right). Young ears en- 
closed in husks were also sometimes chewed. 
Actual size. 
