lp:ssons with plants 



351 



with him such food and other useful plants as can be raised 

 in the ncAv region to which he moves. Thus wheat and other 

 grains have been brought westward from the cradle of civiliza- 

 tion in Central Asia, and our Indian corn, potato, and to- 

 bacco have been carried to the eastern hemisphere. 



But with the intentional introduction of useful plants the 



Fig. 146. The Bright Scarlet Fruit of the Waahoo Remains on the Bushes 

 Long after the Lea\'es have Fallen and thus Attracts the Birds. 



seeds of harmful weeds have also been brought in. Thus 

 the Russian "thistle" was brought over from Russia with 

 some seed wheat. Many other weeds such as daisy, dan- 

 delion, hemp, plantain, and corn-cockle were brought from 

 Europe, generally imintentionally. 



Water-fowl no doubt aid in the distribution of many marsh 

 and water-plants. The wild rice, for example, is carried on 

 the feet, bills, plumage, in the crops of ducks, geese, and other 

 water-fowl, and is scattered on their wanderings. 



