192 FIELD COLUMBIAN MUSEUM BOTANY, VOL. II. 



microcosms, thus forming a basis upon which to judge of the ease or 

 difficulty of dispersion exhibited by certain species; and third: how, 

 and in what conformation, species spread when brought into an 

 untainted environment, thus establishing a datum point for the possible 

 solution of many problems in plant dissemination, as well as those 

 relating to the property inherent in certain plants to maintain their 

 specific characters in newly implanted localities. 



