THE OVULE. 119 © 
parts), and increased development at other parts. The flower 
is considered to consist of a series of whorls of these modi- 
fied leaves, the calyx being the outer or lower whorl; the 
cells of the germen the inner or upper whorl. 
460. The parts of each whorl are alternate with the parts 
of the adjoining external and internal whorl; that is, the 
middle of each organ is opposite to the edges of the corre- 
sponding parts in the adjoining whorls, or opposite to the space 
between the two parts in the next whorls—or the organs in 
one whorl are opposite to the organs in the next whorl but 
one. See Fig. 46. This figure is a representation of a 
Fig. 46. 
usual relative situation of the different parts. The external 
thick black lines represent the calyx ; the open lines within, 
the corolla ; next are seen the stamens : lastly, in the centre 
a There is generally a relation, in number, otween sod 
the different parts of the flower, as seen in the figure, | The 
alternate arrangement of the parts is also illustrated in Fig. 
is seen the germen, consisting of several cells, withthe ovulesin 
the narrow and inner end of each cell, in the centre of the 
