SEED DISTRIBUTION 



153 



the elm (Figs. 137-139), and the tufted ones of the thistle 

 and the ironweed (Fig. 141). The seed capsules of the poppy, 

 the morning-glory (Fig. 142), the evening primrose (Fig. 144), 



FIG. 142. Seed pods of morning- 

 glory beginning to open, so as to 

 allow the seeds to rattle out, a few 

 at a time 



One half natural size 



FIG. 143. Two capsules of the wild 



balsam and a third detached, split 



open, and curled up as it appears 



after throwing the seeds about 



Two thirds natural size 



FIG. 144. Pods of evening prim- 

 rose open at the top and allow- 

 ing the seeds to escape gradually 



Three fourths natural size 



FIG. 145. Fruit of crane's-bill, 

 the carpels splitting away from 

 a central column and thus throw- 

 ing the seeds about 



Reduced 



