and other weeds, rt is probable, in preparing the land for 

 meadow, some of the seeds and fruits were deeply covered, and 

 thus in a measure retained their vitality. Through cultivation 

 the seeds and fruits have been turned up. The seeds of some 



Fig..'. Cnicus pumilum. o. Achenium with pappus. /;. Single plumose thread, 

 c. A part of b. more highly magnified. 



orders differ greatly in their power of germination. The Le 

 gummosa are capable of retaining their vitality for a long time, 

 as the seeds are often provided with hard protective coverings 

 (seed coats), which prevent decomposition. 



