in the Fa generation a number of plants which from the pre- 
dominance of colour and form of the seed and the form of the 
leaf I judged to be the P.M. W.H. W.H.N.D. ; further breeding 
showed that my supposition was correct. 
The new characteristic of this hybrid was that it stooled out 
like millet, producing a much greater amount of green fodder 
than the single-stalked plants hitherto obtained. The plant is 
fairly tall, and the seed ripens early. The cobs contain grains of 
the colours mentioned in the Fr generation, white being pre- 
dominant, blue-grey numerous, while the brown and yellow seeds 
aie very scarce. 1 he colour of the seed has also a distinct numeric 
proportion. I counted the. differently coloured grains of 60 cobs, 
and found that about 75 per cent, of the grains are white, and 25 
per cent. dark. The extremes were — 
427 white to 109 dark 
273 white to 74 dark 
this shows that the white is dominant while the dark is 
recessive, and this is in accordance with the other characteristics 
of the new hybrid. It, however, does not matter what colour 
the seeds are, the dark and white seeds alike producing similar 
plants. 
This hybrid, however, does not breed true, inasmuch as there 
occur specimens which are typical P.M., that is plants of medium 
height, long leaf, and brown seed, ripening late. At present 1 
am trying to eliminate this occurrence. In 1906 I raised the 
hist crop of this final hybrid in Western Australia on swamp 
ground near Pinjarrah, and in 1907 Mr. Bertlioud, manager of the 
Experimental Farm at Hamel, W.A., grew some of it, finding it 
very good and naming it “ Pfister’s Pearl Maize.” From Hamel 
the seed found its way to several farms in the South-West, and 
is now met with in different places. 
In 1909 I cultivated some of this maize at Niagara, 500 
miles east of Perth, in a very hot and dry climate, artificial 
watering being a necessity. And here a new phenomenon oc- 
curred which so far I am unable to explain satisfactorily. Of 
twenty plants which I cultivated, six stooled out bearing male 
and female flowers, thirteen produced only one stalk bearing only 
the male flower, one produced only one stalk bearing only the 
female flower. 
I doubt that here we are dealing with a case which can be 
explained by Mendelian methods. To my knowledge there is no 
precedent of any maize having separate male and female plants, 
nor do I know of any plant of the same class or family behaving 
in this way. 1 believe rather that we have to deal with plants 
which developed abnormally in consequence of the sudden high 
temperature ( 1 14 in the shade), which caused the male flower to 
develop earlier ; in fact, of plants which I examined closely I 
succeeded in detecting embryonic flowers, about a quarter of an 
