The following procedures were observed in scoring the 
cob characters: 1) The number of rows of pistillate spike- 
lets (kernel-row number) was counted in the central re- 
gion of all intact and fragmentary cobs; 2) A fasciated 
cob was considered to be any cob which was obviously 
flat for at least one-quarter of its length. This flattening 
was generally observed at the tip of the cob where it is 
most frequent. Fasciation was not scored in the four-row 
class, although such cobs are at least superficially flat as 
a result of their bilateral nature; 3) Diameters were 
measured in the central region of all intact and fragmen- 
tary cobs. When cobs were fasciated, the average of 
maximum and minimum widths was used; 4) Length 
measurements were made only on obviously intact speci- 
mens (about one-third of the collection); 5) The internal 
characters (pilosity, cupule width, glume length and ra- 
chis diameter) were determined for a random sample of 
fourteen intact cobs from each grade of introgression. 
Pilosity was scored in six grades, the higher numbers in- 
dicating stronger pubescence. Cupule width was meas- 
ured between the lateral wings or ‘‘rachis flaps’’ of the 
cupule. 
Ricwarps’ Cave MaIze 
1,440 cobs were obtained from two of Richards’ Caves. 
One of these caves was subdivided into five areas. Since 
the variability and averages of the data for these areas 
are similar, this collection has been treated as a whole 
(Table II). 
Kernel-row Number. 'Teosinte introgression causes a 
decrease in row-number for all cobs from Richards’ 
Caves, except non-fasciated ones that are above average 
in row-number (Table III). In these exceptional cobs, 
the initial relationship is reversed by an increase in intro- 
gression with row-numbers from twelve to sixteen, 
[ 107 |] 
