RAMOSE INFLORESCENCE IN MAIZE. 
in comparison with a typical ramose ear in Plates VI to X. This 
series could be expanded by the addition of still other intermediate 
ears, but it is believed that these are enough to show the degree of 
variability. 
CORRELATION OF THE EAR CHARACTERS OF THE SECOND 
GENERATION. 
The correlations of the ear characters with the tassel characters 
for these F 2 segre- 
gates have been cal- 
culated and are sum- 
marized in Table II. 
The highest corre- 
lation found between 
the 5 -ear and 4-tassel 
characters is that of 
0.546 between the 
total number of 
branches on the ear 
and the same char- 
acter of the tassel. 
The next highest 
correlation is —0.406 
between the number 
of branches in the 
tassel and the termi- 
nal spike index of 
the ear. This index 
is in a sense comple- 
mentary to the num- 
ber of branches on 
the ear, the correla- 
tion between these 
two characters being 
-0.642. 
The only other 
significant correla- 
tion which does not 
comprise a measure 
of the number of tas- 
sel branches as one 
character is a rather 
unexpected correla- 
tion of 0.398 between the lengths of pistillate and staminate in- 
florescences, which may be an indication of general vigor. 
Among trie ear characters the only significant correlations obtained 
which are not explained readily as being measures of the same char- 
acteristics are the coefficients of 0.756 between the number of 
100 
10 20 30 40 50 60 70 80 30 
4 /4 24 34 44 64 64 ?4 84 94 104 
Fig. 3. — Frequency distributions with respect to the cen- 
tral spike index in maize plants of the Ramosa and 
Gordo varieties and of the normal and ramose segre- 
gates of their second-generation hybrids. Polygons in- 
closed in solid lines : At left, Ramosa ; at right, Gordo. 
Polygons inclosed in dotted lines : At left, ramose seg- 
regates ; at right, normal segregates. The populations 
of Gordo and of the normal and ramose segregates have 
been plotted on the basis of 69 individuals, to facilitate 
comparison with Ramosa. 
