281 



about iu Ambrosia arteniisia'folia due to traumatic causes, as shown by 

 A. C. Life.' This plant was injured by a wagon 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 

 ill the plant itself for some other reason. 



lA. C. Life, Botanical Gazette, 1904, Vol. 38, pp. 383-384. 

 l^J'ouiingtnn, Indiaiid. 



