yo Weeds. 



thistle, in their abihty to travel from place 

 to place through the agency of winds. 

 Weeds which mature their seeds along with 

 those of the clovers and grasses, as many 

 ordinary perennial weeds do, are much 

 more likely to be widely distributed than 

 those which mature their seeds along 

 with those of cereals, owing to the great 

 difficulty that is experienced in separating 

 the seeds of weeds from the seeds of clov- 

 ers and grasses. Again, some forms of 

 weed life, particularly some biennial w^eeds, 

 find a congenial and permanent home in 

 pastures and waste places, although in cul- 

 tivated fields they might not prove very 

 harmful. The labor required to remove 

 these w^eeds from such places is very great, 

 as it has generally to be done by hand ; 

 whereas in the same localities annuals and 

 perennials may not be able to get a footing, 

 because of unfavorable conditions. On 

 account of these conditions, and of others 

 not named, such as the congeniality or 

 uncongeniality of soils, it will be found that 

 in some localities the weeds most difficult 

 of eradication will be annuals, in others they 

 will be biennials, in others thev will be ordi- 



