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I chose as parents the following varieties : — 
1. White American Horsetooth (tall, single-stalked, 
long leal, white seed, late variety) W.H. 
2. Ninety Days’ Maize (medium height, medium leaf, 
yellow seed, very early) N.D. 
3. Peruvian Maize (medium height, long leaf, dark 
brown seed, very prolific bearer, rather late 
variety) P.M. 
The first crosses \vere made between W.H. and N.D., and 
W.H. and P.M. In both cases the W.H. proved the dominant, 
the other varieties being recessive. 
ist Hybridization. 
P (parental) WH x ND 
1 
Fi (ist filial) WHND 
F2 (2nd filial) WH WHND NDWH ND 
Dominant Recessive 
The Fi generation proved to be a variety of medium height, 
long leaf, white seed, and early ripening. 
Of the F'2 generation the WHND was the variety which gave 
the best promise, being tall, very early, having long leaves and a 
pale yellow seed. 
2nd Hybridization. 
p WH x PM 
F 
WH 
WHPM PMWH PM 
Dominant Recessive 
The second Fi generation was of medium height, long leaf, 
a prolific bearer and produced white seeds rather late 
Of the F2 generation 1 considered the P.M., W.H. the most 
suitable. Medium height, long leaf, very prolific (in some cases 
five cobs to one single-stalked plant). I he seeds, which ripened 
rather late, were of blue-grey colour. 
To obtain an early cross-bred P.M., W.H. 1 could have crossed 
it with N D variety, but, considering the advantages which the 
cross-bred W.H..N.D. had over the pure N.D. maize as an ensilage 
plant I decided to cross the two hybrids, 
p WHND x PMWH 
F WHND WHND PMWH PMWH WHND PMWH 
Dominant Recessive 
Naturally all the hybrids contained the W.H. strain, lhe 
P M., W.H. W.H., N.D. proved to be the plant which I desired. 
The Fi generation consisted of tall single-stalked plants, with 
long leaves and bearing numerous cobs, which ripened fairly early, 
showing white, blue-grey, yellow, and brown seeds. There were 
