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they cling to and are carried about attached to the covering of animals 
or the clothing of human beings. Similarly provided for are hounds-tongue, 
stick-tights, tick trefoil, bed-straw, cocklebur, sandbur, motherwort and 
many others. Further, birds and animals devour very large numbers of 
many kinds of weed seeds, not all of which are acted on by digestive juices 
to such an extent as to destroy their viability. These are scattered in bird 
and animal excrement, and grow into new and yigorous plants. 
1. Buekhorn. 
2. Black-seeded Plantain. 
3. Bracted Plantain. 
Noxious weeds are spread through the use on farms of manure and 
sweepings from stock and other cars, and by means of packing about mer- 
chandise and nursery stock. The moving of threshing and other ma- 
chinery from place to place without first cleaning them out thoroughly, 
the use on farms of manure from livery stables in towns and cities, all 
help to spread noxious weeds. The use of impure and adulterated crop 
seed on our farms is responsible in a large measure for the spread of weeds. 
Much of the clover, alfalfa and grass seed used in Indiana today have 
