Fruits and Seeds 



11 



two naked seeds growing on the inner side of each 

 scale (Fig. 7). As the years go on all living things tend 

 to improve themselves and to become more complicated, 

 and so, later on, some plants began to fold the seed- 



Fig. 7. (a) Pine Cone, (b) Upper and under surface of a scale from 

 the cone. The under surface bears two winged seeds. 



bearing leaves over the seeds. At last all but the pines 

 did this. This is how it happens that flowering plants 

 belong to two great divisions ; those with uncovered 



