281 



about in Ambrosia ai'teiui.si;vfolia clue to traumatic causes, as shown by 

 A. C. Life.^ Tliis plant was injured by a wafxon running over it and 

 showed a number of abnormal conditions in which the reproductive pri- 

 mordia had a tendency to change into vegetative parts. 



It is well, therefore, on finding any monstrosities of any kind to con- 

 sider and inquire into the cause or source of the deviation and to try to 

 ascertain whether these deviations are traumatic in origin or are inherent 

 ii^. the plant itself for some other reason. 



'A. C. Life, Botaniral Gazette, 1904, Vol. 38, pp. 383-384. 

 J!J :()i)iington, Indiann. 



