46 ' Weeds. 



are they distributed by means of the man- 

 ures which are purchased in towns and 

 cities, owing to the various sources from 

 which the feed stuffs which are used in 

 these places often come. The purchaser 

 of feed stuffs in towns and cities has not 

 the same interest in looking into the purity 

 of what he buys as the farmer ; hence it 

 would probalDly be exceptional to find the 

 manure obtained from him entirely free 

 from the seeds of foul weeds. Although 

 manure is one of the most common agen- 

 cies by which weeds are distributed, the 

 weeds that are distributed by means of 

 manure are likely to be local in character, 

 rather than distant and foreign. 



5. Packing-eases, evates, ete., that have 

 been used for the carriage of goods. Nox- 

 ious weed seeds are frequently introduced 

 into new localities by means of the straw or 

 chaff in which goods have been packed for 

 shipment. The packing-cases which have 

 held the goods during transport are often 

 purchased by farmers for other uses. When 

 these are brought home by the purchasers, 

 the packing material is thoughtlessly emp- 

 tied out upon the manure heap or thrown 

 aside, the weed seeds which it contains are 



