126 Gardening 
Cross-breeding toma- 
toes. Any two varieties 
of tomatoes may be 
crossed. If they are 
planted together in 
spring, they are certain 
to have some flowers 
opening at the same 
time. For experimental 
purposes it is well to 
select two varieties with 
marked differences, as, 
for example, a yellow 
pear-shaped variety and 
a red variety of ordinary 
shape. 
As the stamens and 
pistils are both found in 
Fic. 77. Avcluster of tomato flowers have the same flower, it is 
been bagged to protect them from other necessary, if one is to be 
seca certain of the parentage, 
to remove the stamens from the flowers that are to be 
pollinated (see Fig. 75). 
Cross-breeding pumpkins. The patty pan, the sum- 
mer crookneck, and the pumpkin may all be crossed, 
yielding interesting results as to shape, color, and size 
of fruits in the second hybrid generation. The stamens 
and pistils are in separate flowers on the same plant. 
The pistillate flowers may be recognized in the bud by 
the enlarged part (ovary) which will later become the 
fruit. 7 
