PLANT BREEDING 189 
kind or of one row are thus detasseled, it is made probable that 
pollen, if received at all by the ears of the detasseled stalks, 
must come from another row or from another kind of corn. 
The detasseling of alternate rows is a rather common way 
of insuring cross-pollination. In most cases of hybridizing 
with bisexual flowers it is necessary to carry out processes 
similar to the following ones: 
1. Select the flower to be pollinated before it 
opens or before its own pollen is mature. If it is 
one of a cluster of flowers, as in the wheat and 
the apple, remove from the cluster of the flowers 
all that are not to 
be operated upon. 
2. Open the re- 
maining flowers 
and remove the 
stamens by taking 
hold of the fila- 
ments with fine 
forceps, or cut 
away all the sta- 
41, flower cut round for removal of the stamens, with mens at once, as 
the removed parts of the young flower showing above; shown in figure 
B, longitudinal section of a flower showing level (s) 2 
: at which the cut was made in 4 162. Keep the 
Fig. 162. A peach flower prepared for hybridization 
flower or the en- 
tire twig covered with a paper bag until the stigma is mature. 
3. When the stigma is mature, pollinate it with the desired 
kind of pollen. This may be done with the finger tip or with 
a camel’s-hair brush or other implement. It is safer to take 
pollen from a flower that has been kept covered with a paper 
bag to keep off foreign pollen. 
+. Keep the pollinated flower covered with a paper bag 
until the fruit has grown considerably. 
178. Plants grown from hybrid seeds. When seeds pro- 
duced by hybridization are planted, the seedlings grown from 
them may vary greatly in their vegetative characters, as size, 
