DISPERSAL, BY BIRDS 



161 



21~>) and thistle (Fig. 27G) are examples. The silk of 

 the milkweed (Fig. 277) has a similar office, and also the 

 wool of the cat-tail (Fig. 278). Recall the cottony seeds 

 of the willow and poplar. 



303. DISPERSAL BY BIRDS. Seeds of berries and of 

 other small fleshy fruits are carried far and wide by 

 birds. The pulp is digested, but the seeds are not 

 injured. Note how the cherries, raspberries, blackberries, 



278. The fruits of the cal 

 tail are carried in the 

 laic- autumn winds, 



and Juneberries spring up in the fence- 

 rows, when- the birds rest. Some ber- 

 ries and drupes persist far into winter, when thej sup- 

 ply t'ddd to cedar birds, robins, and the winter birds. Pig. 

 27!). Red cedar is distributed by birds. Many of these 



pulpy fruits are agreeable as human f I, and seme of 



them have been greatly enlarged or "improved" bj the 

 arts of the cultivator. Consull paragraph 379 for the 

 process by which such result may have been attained 



304. burs. Man} seeds and fruits bear spines, hooks, 

 and hairs which adhere to the coats of animals and to 



