Akad.'
Berlin October 1872 page 743.) It is also anemophilous, or is fertilised
by the wind; and of such plants only the common beet had been tried.
Some plants were raised in the greenhouse, and were crossed with pollen
taken from a distinct plant; and a single plant, growing quite
separately in a different part of the house, was allowed to fertilise
itself spontaneously. The seeds thus obtained were placed on damp sand,
and as they germinated in pairs of equal age were planted on the
opposite sides of four very large pots; nevertheless they were
considerably crowded. The pots were kept in the hothouse. The plants
were first measured to the tips of their leaves when only between 1 and
2 feet in height, as shown in Table 6/97.
TABLE 6/97. Zea mays.
Heights of plants measured in inches.
Column 1: Number (Name) of Pot.
Column 2: Crossed Plants.
Column 3: Self-fertilised Plants.
Pot 1 : 23 4/8 : 17 3/8.
Pot 1 : 12 : 20 3/8.
Pot 1 : 21 : 20.
Pot 2 : 22 : 20.
Pot 2 : 19 1/8 : 18 3/8.
Pot 2 : 21 4/8 : 18 5/8.
Pot 3 : 22 1/8 : 18 5/8.
Pot 3 : 20 3/8 : 15 2/8.
Pot 3 : 18 2/8 : 16 4/8.
Pot 3 : 21 5/8 : 18.
Pot 3 : 23 2/8 : 16 2/8.
Pot 4 : 21 : 18.
Pot 4 : 22 1/8 : 12 6/8.
Pot 4 : 23 : 15 4/8.
Pot 4 : 12 : 18.
Total : 302.88 : 263.63.
The fifteen crossed plants here average 20.
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