MANUAL OF NATURE STUDY. 
37 
the stigma. The little grains in the ovary are 
called ovules. The teacher should now review all 
the whorls, and parts of each whorl. 
Next ask certain pupils of the class to bring 
to the school-room on another day some member 
of the Mustard family, or some other simple 
flower, so that the children can compare the parts 
of the new flower with those of the Spring Beauty 
in every particular. At another time, a different 
flower, and so on, until a half-dozen flowers have 
been analyzed and names learned. 
Up to this time, nothing has been said about the 
function of the parts of the flower. We may now 
begin this subject by introducing factories in gen¬ 
eral. A factory is a building in which goods are 
manufactured, as a mill, where flour and meal are 
made. Let the children give other examples, nam¬ 
ing in each case the raw material out of which 
must come the manufactured product. The flower 
of the Spring Beauty is a factory. It manufactures 
Spring Beauty seeds. The raw material is pollen 
and ovules. These two kinds of stuff must be 
mixed together at just the right time or the goods 
will be spoiled. The ovary is the hopper, the style 
is the tube through which the pollen must grow 
downward to the hopper, where the ovules are. 
The stigma must be moist when the pollen is let 
